"Teacher, I... I have someone I like. It's... a man."
Woo Hyun likes his homeroom teacher and didn't want anyone to know until after graduation, but he was caught by his best friend, Do Ha. After that, Do Ha's attitude changed. Woo Hyun thought he had disappointed him by liking men, despite their promise to be honest with each other.
"I— I'm saying that I like you." was Do Ha's response.
And so, Woo Hyun made a proposition, wanting to give up on his teacher:
"Let's date... but only until graduation."