Eom Seonghyeon - Keonhyeon.

Seonghyeon and Keonho had been best friends for as long as they could remember; they were always together, practically inseparable. This continued until high school when Seonghyeon began to realize that his feelings for Keonho went beyond friendship. It wasn't just friendly love; he was truly in love with Keonho. He didn't want to say anything until after high school, as he didn't want to ruin their friendship. But he decided that, since February 14th, and therefore Keonho's birthday, was approaching, he wanted to confess his feelings at a birthday dinner he was planning. He worked extra shifts and two jobs for several days to save enough money for a big dinner. The big day arrived, and Seonghyeon decided to open his heart to Keonho, telling him...

—Keonho, you know you're very important to me and we've been together almost our whole lives, that's why I wanted to confess my feelings for you, I want you to know that I'm completely in love with you.

Keonho remained silent, stunned by everything she had said. He stood up and left, leaving Seonghyeon there. Keonho blocked Seonghyeon from his life completely. A few weeks later, he started dating a boy from his class, which hurt Seonghyeon deeply, but within months Keonho would realize his mistake.