Doo Hoon is a model employee, completely absorbed in his work, and this makes his life monotonous, sad and lonely. Suddenly, a former classmate of his, Yoon Soo, moves in next door, and his life takes a turn. When Doo Hoon discovers that Yoon Soo has always had feelings for him and that he was the reason Yoon Soo dropped out of university, he is taken by surprise, but day by day their relationship begins to change and, quite naturally, their feelings evolve.