October 1989. Oxford, UK

Yeonjun is a young guy living in 1989. He comes from a wealthy family, his father is a lawyer and his mother is a prosecutor. Yeonjun attends a prestigious private school for boys called Welton Academy. Every year he goes on vacation to his hometown and returns to his friends and classmates.

Yeonjun has a lot of friends, he is quite popular and the teachers think that he has a great future thanks to his father who studied at the same academy when he was young.

Things get weird when Yeonjun's old roommate Soobin transfers to another academy and leaves Yeonjun alone in his room. Yeonjun is used to his roommate being Soobin, they grew up together and were friends for so many years. It becomes difficult when, instead of Soobin, a new guy named Beomgyu appears in the room, who is very silent and shy compared to the guys in this academy. Beomgyu is Yeonjun's new roommate.