All romances have an end

One day, returning home earlier than expected, Dohan comes face-to-face with his first love and long-time partner rolling around in his own bedroom with his student. The shock of the betrayal by the partner he trusted is short-lived, for Gu Ajun—a younger boy he used to adore as a child—moves in next door... Unlike the pretty child he once was, Gu Ajun has grown into a magnificent man, and for some reason, he feels unfamiliar. --- Gu Ajun, Lee Jaejin. Summer of their twentieth year. [Gu Ajun: I'm going back to Korea. To confess.] [Lee Jaejin: Whatever. I told you they haven't broken up yet. I bet they'll never break up.] [Gu Ajun: I'll just confess, get rejected, and live like King Ui...