To clarify because I think some people are confused, the polar bear guy likes Su Ye. It’s also established before that he doesn’t like women because they fawn over him and it makes him uncomfortable (but Su Ye is different). Big Tree thinks that Su Ye likes polar bear guy and because polar bear guy is popular with women he thinks polar bear is a player. He also wants to “expose” this because he doesn’t want Su Ye to be hurt. Meanwhile, Su Ye likes Big Tree and Big Tree likes Su Ye but they’ve yet to find out it’s mutual. I’m assuming that polar bear will be a catalyst for their relationship (since they’re both dense af) but we’ll just have to see