Geonwoo, who is a virgin and a lifelong single, has been lying about having a lot of experience. When Haneul overhears this secret, he approaches Geonwoo, suggesting they become new partners. Caught up in the moment, Geonwoo accepts Haneul's offer to sleep together...

"I wanted to become close with you, Hyung, too." "Oh really? Then, should we get close quickly?"

He thought it would be his soft first kiss and thrilling first experience with his "Hyung," but when he opens the door, the person he sees is the handsome and well-built man, Jiho.

[The following dialogue is from the provided synopsis, likely spoken by Jiho or Haneul to Geonwoo:]

"Geonwoo, what I like the most is splitting you open until you tear, and then putting in two."