Responses
I am too lazy to check, but I think he just guessed on his own based on how the couple acted. It was around the start of the last season, I think.
Tae asked him what he would do if a guy confessed to him. And he observed Tae get mad when the annoying friend was talking to Bom about getting a girlfriend.
This
I don't remember this moment, anybody can remind me? haha