After being overwhelmed by work, Sang-a attends her high school reunion for the first time in seven years. There, she unexpectedly reunites with Si-hyun, who had a lot of incidents and accidents during their school days. Si-hyun, with his bad habits, instantly freezes the atmosphere at the drinking table with his harsh words. It would have been fortunate if it had ended there.\n\n"He likes Yu Sang-a, you know."\n\nSang-a can't hide her embarrassment at the gossip about Si-hyun from their classmates, and she finds herself at a loss in front of Si-hyun, who is unintentionally trapped with her behind a partition. However, Si-hyun, the subject of the rumors, only chuckles in disbelief. Finally, as the seemingly endless gossip comes to an end and the voices of their classmates fade away outside the bathroom,\n\n"Sang-a, what you heard and saw here is what?"\n"...Nothing happened?"\n"As expected of the top student in our class, you're clever."\n\nSi-hyun chuckles softly and then gestures for her to go outside.\n\n"You should go ahead. If we leave together, rumors will spread that we ended up having sex."\n\nWith a meaningful smile, Si-hyun emphasizes that Sang-a should be careful with her words, but he doesn't deny the rumors. After that, Sang-a and Si-hyun begin to get involved in work together...