I liked it first. I can only watch the sex of my unrequited classmate, who hasn't started yet, in front of me...

[Please take a look at the PR too! 】BSS (even though I liked her first) is a situation in which someone else is preempted by someone they have a crush on because they have not expressed their feelings and are not in a romantic relationship. It's similar to NTR, but since there's no romantic relationship, no one is at fault, and you can experience strong self-loathing and depressing erection. This is a classic BSS drama about a man who ends up having a romantic relationship with his best friend and can't do anything, which is a classic BSS situation.