As much as the 2nd lead syndrome is strong in this one. JaeYeon's bff Tae U kinda brought this on himself. He should have never let his idol brother get anywhere near JaeYeon. But what does he do? He introduces them and suggests they have a sit down interview. Considering the troubled history you have with your brother, why would you do that?! After the misunderstanding was cleared up they should've went their separate ways and never make contact again. But because of you not only do they have something in common but they have reason to get to know each other better.