31. Wild Sex with the Eldest Daughter at Mother-in-Law's Company, and the Sister-in-Law Who Peeps.
31. Wild Sex with the Eldest Daughter at the Mother-in-Law's Company, and the Sister-in-Law Who Peeps.
[Lively Brat Seo Ji-eun] Brother-in-law!!! Are you okay!? Are you alive!??
[Me] I am alive, Private Seo Ji-eun...
[Lively Brat Seo Ji-eun] Ugh... You actually survived in front of Grandpa!
Seo Mi-na had insisted there was no need to visit Grandfather Kim Il-do, but her mother Kim Seo-yeon persuaded her over and over until the visit was finalized. Though Kim Seo-yeon herself had been disowned when she married, she didn't want her daughter to suffer the same fate.
[Da-hye Sensei] Grandpa was pretty gruff, wasn't he...?
[Me] He had an incredible presence, didn't he?
[Me] But it wasn't unbearable.
[Me] I was wearing the suit you picked out—how could it have gone badly?
[Lively Brat Seo Ji-eun] I was the one about to die waiting for news!!
Of course, Geum Tae-yang didn't own a proper suit. He had to buy one, and while both Kim Seo-yeon and Seo Da-hye knew Kim Il-do's tastes well, Kim Seo-yeon was too busy, so Seo Da-hye took charge of guiding Tae-yang for this occasion.
[Da-hye Sensei] Honestly, Zegna suits are way too much like Grandpa's style.
[Da-hye Sensei] I don't think they suit Brother-in-law's vibe.
[Lively Brat Seo Ji-eun] I agree!
[Da-hye Sensei] I'll get you a properly fitted one as a gift soon.
[Me] No, no! I like this one!
[Lively Brat Seo Ji-eun] I agree!
[Da-hye Sensei] Really...?
[Me] Yeah!
[Da-hye Sensei] Then I'm relieved, Brother-in-law...
The made-to-measure suit was crafted from Zegna Trofeo fabric—charcoal gray, single-breasted with two buttons and a notched lapel. The fit was semi-classic.
'I can't possibly get another 12-million-won suit from my sister-in-law...'
It cost a whopping 12 million won. Seo Da-hye's taste leaned toward even pricier options, but she had to tone it down to match Grandfather Kim Il-do's preferences as closely as possible.
[Me] Can I wear this when I go see Aunt too?
Who was this "Aunt" Tae-yang was referring to? None other than Kim Seo-yeon's younger sister, Kim Seo-hui. Kim Seo-hui was the head of the Strategic Business Division at Terra Nova Bio Medical.
Though the Strategic Business Division itself was the company's core, Kim Seo-hui's actual influence extended across the entire corporation—she was being groomed as the next CEO.
[Da-hye Sensei] Aunt prefers casual wear outside of work.
[Me] Oh, really?
[Lively Brat Seo Ji-eun] But Aunt herself always dresses impeccably!
Kim Seo-hui was the closest to Kim Seo-yeon in the family. However, she was currently on a business trip abroad, so Tae-yang wouldn't be able to meet her for marriage formalities for a few more days.
"Sigh... So the days of us having coffee together here are almost over?"
A certain man standing beside Geum Tae-yang on the rooftop of the Sejin Logistics building couldn't hide his complicated regret.
"I'll visit often, Myeong-ho hyung."
"Those words only make me feel an even deeper sorrow..."
It was Yu Myeong-ho. Geum Tae-yang was leaving Sejin Logistics. Tae-yang himself had intended to keep working there, but his mother-in-law's side wanted him to share their living space so they could spend more time together.
And, as it happened, a new job connected to Kim Seo-yeon's family had already been secured.
'Ugh... I can already feel the gap between me and that bastard Tae-yang widening...'
What did the "complicated" emotion attached to Yu Myeong-ho's feelings signify? It was the bitterness of defeat—the junior he had always looked down on as beneath him, the butt of rank-based jokes, had now grown into an unreachable figure.
"Father told me to thank the CEO of Galleria Cheongdam. Thanks to her, we landed a big contract. He'd been struggling with expanding the business due to lack of decent opportunities."
"It's because Sejin has been doing well. Anyway, I'll pass that along to Mother."
To Kim Seo-yeon, who adored her future son-in-law, Yu Myeong-ho and Sejin Logistics were benefactors. If not for them, Geum Tae-yang wouldn't have come to Seoul.
She had been wondering how to repay them when, coincidentally, an acquaintance running a mid-sized company was looking for a logistics partner. After checking Sejin Logistics' performance, she connected them.
'Goddammit!!! This is total defeat... I raised a tiger myself...'
From Geum Tae-yang's current smile, Yu Myeong-ho sensed an aura—the aura of someone who had risen high. Tae-yang was no longer the junior he could treat to meals at will.
[Lively Brat Seo Ji-eun] Brother-in-law, have you ever even passed by Mom's building?
[Me] The only times I've been to Cheongdam were twice—when Mi-na and Sister-in-law Da-hye bought me clothes.
Now, with his semi-basement room about to be cleared out, Geum Tae-yang was scheduled to visit Kim Seo-yeon's Galleria Cheongdam Cultural Center.
'Honestly, I'm even more nervous about this than I was about meeting Chairman Kim Il-do...'
"It's all because of my mother-in-law's job offer, you see."
This position was created because Kim Seo-yeon, as the CEO, wanted to proudly show off her soon-to-be son-in-law to her cherished employees. That's why Geum Tae-yang had been nervous for days. He couldn't shake the feeling that, as a son-in-law, he would inevitably fall short of his mother-in-law's elegant aura. People really do start wanting more when they care about someone, huh.
Kim Il-do? An important figure, sure, but honestly, Tae-yang didn't feel much about him either. He had already assumed the man wouldn't like him from the start. But his mother-in-law was someone who genuinely loved him. He wanted to live up to her expectations.
[Lively Brat Seo Ji-eun]
"Whaaaa... I wanna go too... Why does it have to be on a weekday..."
[I]
"Obviously because there are no staff on holidays, dummy Ji-eun."
[Lively Brat Seo Ji-eun]
"Ugh, that's so obviously right I can't even argue..."
Seo Ji-eun wanted to follow Tae-yang to every official appointment. But Kim Il-do's mansion was a no-go thanks to Mom, and now Galleria Cheongdam was at risk of being cut too because it was a weekday.
[Lively Brat Seo Ji-eun]
"Unnie, you HAVE to text me live updates, okay?? Promise??"
[Da-hye Sensei]
"Wouldn't it be weird if I tagged along...?"
Ji-eun's backup plan was to use Seo Da-hye—whose university classes ended early that day—as her avatar.
[I]
"What's weird about it?"
"Honestly, I'd feel way more at ease if you came with me, Da-hye."
[Da-hye Sensei]
"You... think so...?"
It wasn't like she was the main focus of this visit. Da-hye hesitated, but Tae-yang's thoughts were different.
[I]
"Of course. We're family, aren't we?"
[Da-hye Sensei]
"Ah...!"
[Lively Brat Seo Ji-eun]
"Exactly! We're family! So Unnie, you HAVE to go and text me updates!"
This wasn't just about introducing Tae-yang as Seo Mi-na's partner—it was about welcoming a new family member. How... is Brother-in-law this thoughtful and wise...?
Thump! Thump! Thump!
Deep down, Da-hye wanted to go. But as always, her considerate nature made her hold back—until Tae-yang's perfect response sent her heart racing with emotion.
[Da-hye Sensei]
"Then... I'll come with you."
[I]
"Brilliant decision, Sister-in-law!"
[Lively Brat Seo Ji-eun]
"Whoa! Of course, only Brother-in-law could convince Second Unnie!"
And so, Seo Da-hye became the youngest sister's designated avatar.
"Ugh..."
That morning, Tae-yang and Seo Mi-na headed to the penthouse, where they boarded Kim Seo-yeon's Range Rover SV along with Da-hye, making their way to Galleria Cheongdam as a group of four.
Though he'd seen pictures, this was Tae-yang's first time facing the actual Galleria Cheongdam building in person. The sheer presence of the elegant mid-sized building in Cheongdam left him speechless.
Kim Seo-yeon:
"It's been a while since I've been here myself. I've handled a lot of paperwork for the place, though."
Seo Mi-na:
"Right, that's true. Thanks to Tae-yang, we get to visit Galleria together—it's nice, isn't it?"
They entered through the VIP and executive-only entrance. The plan was to finish their scheduled meetings on the 11th and 12th floors first before showing Tae-yang around the galleries and café.
Seo Da-hye:
"Brother-in-law, there's no need to be nervous. Everyone here is really kind."
Tae-yang:
"Ah, is it that obvious?"
Seo Da-hye:
"Yes..."
Normally, Tae-yang would've jumped into the conversation between Seo Mi-na and Kim Seo-yeon. But he was too tense, swallowing his words with a stiff expression. Worried, Da-hye did her best to reassure him.
What's up with Brother-in-law...?
But there was something Da-hye didn't know.
Tae-yang:
"Pleased to meet you. I'm Geum Tae-yang."
Staff Member:
"I thought you were here for the model shoot in the studio today!"
Kim Seo-yeon (laughing):
"Hohoho! He's my future son-in-law, but I can't exactly argue with Manager Kang's assessment!"
He's the real-deal type. The same man who'd turned pale and rigid inside the VIP elevator now exuded effortless charm the moment he stepped out, transforming into someone perfectly suited for that 12-million-won designer suit. His stature carried model-like presence, his face rivaled a movie star's, and above all, his attitude overflowed with the weighty confidence of a chaebol family's son-in-law.
"Mom had the exact same expression as you do now when we visited Grandpa's house."
There was a reason neither Seo Mi-na nor Kim Seo-yeon bothered to comfort Geum Tae-yang despite his obvious nervousness—they'd already witnessed this before. Though his texts with his sisters-in-law suggested he was tense upon arriving at Kim Il-do's residence,
the moment he stood before the patriarch, he became an entirely different person. 'Whoa... I've never seen Mom maintain such an unshakable smile in front of company people before...'
Kim Seo-yeon sought familial bonds with her employees, yet never abandoned her professional demeanor. At the end of the day, business was business, and results mattered. That was why she rarely showed her "Mi-na's mom" side outside—
yet beside Tae-yang, she disarmed completely, smiling her natural smile. 'Mom leans on him too...'
It was as if she had cast off the burden of being the family's head. After experiencing Tae-yang's unflinching presence even before her father, Kim Il-do,
Kim Seo-yeon unconsciously felt as though she had regained the sense of a household head—something she'd lost after the rift with Seo Min-jun began. 'Ha... What kind of sorcery is this?'
At that moment,
while Kim Seo-yeon and Seo Da-hye were both swaying under the weight of Tae-yang's commanding presence as the family's pillar,
Seo Mi-na found herself in an entirely different kind of experience. 'That's the CEO's eldest daughter's fiancé? Isn't he way too handsome?'
'He doesn't get overshadowed by the CEO's visuals at all...'
'So... sexy...'
Given the nature of their industry, the 11th and 12th floors—housing cultural business offices—were predominantly filled with women. The gazes of females in their prime, locking onto a dominant male,
meant that the bride-to-be, Seo Mi-na, had now become acutely aware of the surrounding females eyeing her man with primal reproductive urges. 'Hah... When he wasn't dressed up, he felt like my own hidden gem... But now that he's polished and gleaming, he's like some dangerously attractive bad boy who triggers jealousy...?'
Warning signs had appeared even back when they first went shopping for his suit. But refinement, too, needs time to settle into its rightful place—
and after a series of high-profile events, Tae-yang's grooming had finally drawn out the long-suppressed femme fatale aura buried beneath his nerdy style.
"Oh? CEO Jung is here?"
Having finished their schedule at the cultural business offices, the four were about to head down to the studio and gallery. But an important VIP had arrived unannounced.
"It'll probably be some intense business talk. But it shouldn't take too long. Will my babies wait for me on the 13th floor?"
Normally, she'd take them along for introductions. But sensing the situation, Kim Seo-yeon asked for Tae-yang and her daughters' understanding. The 13th floor housed her private office.
"It's fine, Mom. I'll show Tae-yang around your office and terrace while we wait."
Thud!
"Yes, we'll see you later, Mother."
"That's my girl. It really won't take long."
From Mi-na's perspective, there was no reason to throw a tantrum. But the way she firmly gripped Tae-yang's arm—
"...!"
Seo Da-hye, sensing something odd, shot them a silent glance.
"Unnie, I'll head down to the lounge on the lower floor to take a call."
With that, Kim Seo-yeon took the elevator down first,
while Seo Da-hye excused herself to the private dining lounge on the 7th floor.
"Wait, why not just take the call upstairs?"
"It's... kind of a personal conversation."
"Alright, come back soon, Da-hye."
Tae-yang tried to dissuade her from going alone, but Mi-na readily agreed with her sister's decision.
"Come with me."
"Huh?"
The moment Seo Da-hye disappeared beyond the staircase, Mi-na seized Tae-yang with a rough yank.
THUD!
"W-Woah?!"
Where did she drag him? Straight into the 13th-floor office bathroom. Then, without hesitation, she shoved him into a stall and forced him to sit.
"What the hell are you doing?! Since when is yanking someone into a bathroom to 'show them around' considered manners?!"
Tae-yang growled in protest at his fiancée's absurd behavior.
'Ooooh!'
But soon, he had no choice but to shut his mouth.
"Mmmph—! ♡ Mmm...! ♡ Mmmf—! ♡ Hahh...! ♡ Mmmmph—! ♡"
"Oof! Mi-na, you—mmph!"
A kiss—Seo Mi-na's domineering, alpha-female kiss—had claimed his mouth in a voracious assault.
"You bastard... Why do you look so damn good today...?"
"Have you lost your mind?!"
"Kih-hih! You just realized I'm crazy? I am crazy—a crazy bitch obsessed with you, you bastard."
For roughly three minutes, she kissed him relentlessly—like a cow licking his face clean. Seo Mi-na marked her territory over her male with near-feral intensity. Then, pressing her face close to his with eyes brimming with madness, she muttered, "Snap out of it! We're in a bathroom! What if someone walks in?!"
"Only my mom or our family can come in here."
"Which means your mom or Sister-in-law Da-hye could show up!"
"Fuck, I'm so turned on right now—why the hell should I care about that?!"
Rustle! Rustle! Rustle!
Of course, Geum Tae-yang could tell she was dead set on fucking him right then and there. The Femme Fatale in him scrambled for logical reasons to stop her—
But Seo Mi-na, the madwoman who had sensed danger from the gazes of other females,
had already undone the belt of this dangerous man without hesitation.
"Stop! This isn't right! If you're the daughter of Galleria Cheongdam's CEO, Kim Seo-yeon, you can't do this!"
"Mhm! My mom quit being an idol because she got pregnant with me. So I can do this—because I'm her daughter."
Shhk! Shhk!
"You goddamn shameless, unfilial brat!"
Tae-yang desperately flailed to avert disaster. But the more he resisted, the more Mi-na taunted him, stripping him down past his belt until his pants were around his knees—
Thud!
Now exposed in the empty space between them was his fully erect, 23cm cock.
"You're gonna act all high and mighty with a dick like this? You want to fuck me too, don't you?"
"Damn it! Are you a savage?! Just because your body's turned on doesn't mean your mind can't refuse!"
Of course, even a pervert like Tae-yang had to admit the situation was arousing. Flustered, he scolded his would-be bride, even wagging a finger at her—
Whoosh!
"Keep refusing. The more you do, the hotter I get right now. Sluurp!Pop! ♡"
His reprimand might as well have been a custom-made aphrodisiac for Mi-na. Without hesitation, she bent down and deep-throated his throbbing erection.
Gluck!
Oooom—!Squelch!!!
The mind-shattering stimulation—
Geum Tae-yang shuddered as if melting, his femme fatale physique—the very one that had bewitched every female employee at Galleria Cheongdam—twitching uncontrollably.
And in the midst of this depraved scene unfolding in the third stall of the 13th-floor restroom—
"Unnie is...! Brother-in-law's... that place...!!"
Unbeknownst to them, Kim Seo-yeon's second daughter, Seo Da-hye—who had secretly followed them—was eavesdropping from the adjacent second stall.