Ulsan
The day after clearing the Lotte World dungeon, Kang Dohyun checked on Lee Chaerin's condition first thing in the morning.
"Master... Master... I love you so much. Hehehe..."
It had been only ten days since Lee Chaerin had become Kang Dohyun's slave. Yet in that short span, she had changed drastically.
It was a brief period, but she had endured tremendous suffering.
And the only way to escape that suffering was to have sex with Kang Dohyun. His "Rational Rapist" trait had activated, driving her affection for him to maximum levels at breakneck speed.
The problem, however, was that she was now suffering from severe psychological damage.
She had been subjected to frequent adrenaline-fueled sex—effects equal to, if not worse than, drug-induced encounters. The massive adrenaline surges from her extreme headaches, combined with the overwhelming physical pleasure and neurotransmitter floods that hit her the moment she had sex with Kang Dohyun, had ravaged her body.
Her mind was beginning to fray, and she was growing increasingly addicted to pleasure.
'She's breaking down a little at a time.'
Lee Chaerin was deteriorating, but Kang Dohyun didn't care. In fact, he thought it was a relief.
She had been a dangerous woman. It was better that she broke down and became easier to manage.
'All I need is to sleep with her once a year to get the skills. That's it.'
Her mental state or condition didn't matter for using her trait.
Most importantly, Kang Dohyun didn't think of Lee Chaerin as his woman. She was nothing more than a convenient sex slave.
As Kang Dohyun was checking on Lee Chaerin, a message arrived.
Kang Dohun had returned after staying up all night at the party the day before. Dohyun flew his brother back to the base camp via drone, and the four of them were reunited.
Kim Suga, naturally, had prepared breakfast.
"Oh? This is good."
"Hehe, I'm good at it, right?"
Kim Suga's cooking skills—using the various canned goods and combat rations that the brothers carried around—were improving day by day.
As the brothers ate their satisfying breakfast, they discussed their plans.
"Dohun, we don't need to stay here any longer, right?"
"Huh? Yeah. What about you, hyung?"
"I'm done here too."
His main objective in Busan had been to dismantle the NC Department Store Group, and he'd achieved that. As a bonus, he'd acquired Lee Chaerin and formed a connection with Go Jaehyun.
"Then let's move. But where to?"
At that question, Kang Dohyun pulled out a map and studied it.
"Changwon or Ulsan."
After deliberating over the map, Kang Dohyun made his decision.
"Let's go to Ulsan. From there we can reach Gyeongju or Pohang."
Ulsan made the most sense for their next route.
"Alright, let's do it. When do we leave?"
"After breakfast. We'll pack up and go."
The brothers quickly settled on their departure.
The two women had been quietly listening to their conversation. Lee Chaerin didn't care about moving—she was Kang Dohyun's slave and had no say in decisions. But Kim Suga's mind was troubled.
'This is goodbye, then, I guess.'
Life with Kang Dohyun had been good. It had been truly stable and peaceful.
Managing Lee Chaerin was a bit absurd, but it wasn't something she couldn't handle.
'At least I'm alive and not sold as a slave. That's enough.'
Kim Suga knew the reality, but she still felt a pang of regret at the thought of the brothers leaving.
As she resigned herself to it, Kang Dohyun made an unexpected offer.
"Ms. Suga, we're heading to Ulsan. Would you like to come with us?"
"Huh?"
She answered in a fluster, and Kang Dohyun made his offer clear.
"We still need someone to manage Lee Chaerin. If you continue managing her and help us as you have been, I'll make sure to reward you properly later."
Kim Suga, who served as both cook and caretaker for Lee Chaerin, had value. That was why Kang Dohyun made this offer.
"Yes, I'd love to! I'll work hard!"
Kim Suga, who had grown fond of the stable life with the brothers, accepted immediately.
After breakfast, Kim Suga began packing her things quickly, and Kang Dohyun told his brother:
"Dohun, go buy what we need at the market."
"Got it."
He headed to the small night market near the Gimhae City Hall and began purchasing supplies for their move to Ulsan.
Meanwhile, Kang Dohyun turned to Lee Chaerin.
"You'll be traveling bound."
He began tying her up with rope. To prevent her from thrashing in pain during transit, he bound her entire body in an M-shaped position with her legs spread wide.
"But I'll put this in for you."
Thwump!
"Haaang!!"
He inserted a large vibrator into her ass and gagged her so she couldn't make noise. Then he placed a heavily tinted helmet over her head and wrapped her body in a Cloak of Silence. Lee Chaerin's departure preparations were complete.
Kang Dohun bought everything they needed: some rice and grains, extra clothes and equipment, and finally two bicycles for the four of them to ride.
With all preparations finished, the group gathered in front of the Gimhae City Hall.
"Then, let's depart."
Kim Suga rode on the back of Kang Dohun's bicycle, while Kang Dohyun tied Lee Chaerin to his back and mounted the other bicycle.
The two bicycles set off along the road, heading north toward Ulsan.
As the group cycled along the national highway near the coast, zombies appeared one or two at a time.
Thwack, thwack!
Kang Dohyun dispatched them easily with his crossbow, and they continued moving.
It was a leisurely pace, like a stroll—but that leisure would not last long.
"Hyung, that's a red barrier."
"Huh, a dungeon."
A massive dungeon with a red barrier appeared to the left of the road they were passing.
"Where is this?"
Kang Dohyun already knew the answer to his brother's question.
"The largest dungeon in this region—the Gori Dungeon."
The Gori Dungeon had formed in the area where the Gori Nuclear Power Plant once stood. It was a dungeon Kang Dohyun hadn't been able to clear even before his regression, and it remained an extremely dangerous dungeon even ten years after the apocalypse began.
"And this red dungeon marks the border between Busan and Ulsan."
Using this red dungeon as a boundary, Busan and Ulsan divided their territories.
The group continued along the road, keeping the red dungeon to their side. About thirty minutes later—
"Hyung, another dungeon."
This time a dungeon with a green barrier appeared. Kang Dohyun checked the map and said:
"This is the Energy Fusion Industrial Complex... It looks like it merged with the Hansanwon housing complex next door to form a small dungeon."
An unexpected place had become a dungeon.
"Hyung? But if it's green, isn't it easy?"
"The easiest. Easier than Lotte World, which we cleared yesterday."
"Then? Isn't this a steal?"
"Definitely a steal."
After that exchange, the brothers simultaneously dismounted their bicycles.
Kang Dohyun flew the group via drone to a four-story villa three minutes away, then landed on the rooftop.
"Ms. Suga, there are no zombies around, but just in case, please stay here carefully. And Lee Chaerin—take care of her for me."
"Yes."
Leaving the two women on the rooftop, the brothers went down to clear the zombies inside the building.
Kim Suga locked the rooftop door first. Then—
"I'll help you."
She turned to Lee Chaerin, who was still bound and suffering from a headache.
Squelch, thump! Squelch, thump!
"Mmph! Mmmph! Mmph! Mmmmmph!"
She began shoving a dildo into her ass. Lee Chaerin moaned and reached climax.
An hour after Kang Dohyun and Kang Dohun entered the dungeon, its barrier disappeared.
"Wow? That was too easy."
"Tell me about it."
The green barrier dungeon was actually Kang Dohyun's first experience with one. It had been so weak that many early warriors had targeted and cleared it, so he hadn't encountered one even before his regression.
"No special undead, either. About 400 zombies? Maybe not even 400?"
"I know."
Kang Dohyun was just as bewildered by how easy the dungeon had been.
"Still, it's good. Dungeon clear rewards are separate."
"Yeah, nice."
No matter how easy, it was still a dungeon. The two brothers were satisfied with the bonus rewards.
It had only been an hour, but it was enough time for problems to arise. So the brothers flew via drone to the rooftop where Kim Suga and Lee Chaerin were waiting—and fortunately, nothing had happened.
"Nothing unusual, right?"
"Nothing. Ms. Lee Chaerin is sleeping."
After hearing Kim Suga's report—
"Let's head out again."
The four of them flew via drone back to where they'd left the bicycles.
"....."
The problem was that their bicycles had been stolen in the meantime.
"That's a mistake."
At Kang Dohyun's words, his brother laughed.
"Hyung makes mistakes too?"
"I'm human too."
Even his inventory had two empty slots, so Kang Dohyun's mistake was confirmed.
"Can't help it. Let's walk. Tie her to my back."
Kang Dohun tied the still-sleeping Lee Chaerin to Kang Dohyun's back with rope, and the four of them began walking along the national highway.
They hadn't walked far when another white barrier appeared in their sight.
"Another dungeon?"
They ignored that one and walked a bit further, but now multiple barriers came into view.
"Hyung, this place is crazy."
There were barriers of all kinds. And all colors—green, yellow, white, even blue!
Circular barriers of various colors were scattered everywhere.
"Hyung, what is this place?"
At his brother's words, Kang Dohyun looked at the map and recalled his past memories.
"Right. Ulsan was the dungeon city."
Ulsan's nickname was the dungeon city—a city with that many dungeons.