“I hate this. Ginseng doesn't agree with me.” “……” “You’ve been waiting on me hand and foot for three years, and you still don't know that?” Baek Ruby is the young master of the BH Group and Haeseo's meticulous boss. After enduring all sorts of workplace abuse and unreasonable demands from him, Haeseo finally declares her resignation after three years. One night, while waiting for her resignation to be approved... “D-Did I... sleep with another woman?” “Pardon?” “Yeah... I think she was just about your size.” Haeseo accidentally commits the ultimate disaster of taking her intoxicated boss's virginity. Leaving behind a boss who couldn't remember the previous night, she hurries to process her resignation, but... an unfortunate accident causes him to lose nine years of his memories completely. “So, in front of people, you use formal language with me?” “Yeah.” “And I get to talk down to you?” “Yes, exactly.” Just like that, the arrogant, abusive twenty-nine-year-old boss vanished, and a twenty-year-old Baek Ruby who only follows Haeseo around awoke. “Is this perhaps some kind of roleplay?” ...How on earth is she supposed to get this 'dog-like' boss back to normal?