I don't think he's jealous or worried he will leave him for his brother but instead worried that his brother will shit-talk about him as usual and it will change his feelings or something.
Which won't happen obviously but we should keep in mind that his brother has been basically isolating him from everyone his whole life and changing people's perceptions of him.
I didn't plan on crying the first thing in the morning but here we are.
I can't help but feel bad for chairman as well since he's not entirely bad and evil, just stuck in his stupid, old principles and I can't wait for his character development cuz it's clear he cares about his son just doesn't know how to step over his outdated beliefs but he's realizing he messed up, which is a first step.
Also I love despite how silly and funny the story is, there is still a space for character writing and developments, writing is truly good!
So Jigu jumped from one misunderstanding to another and thinks Neuta was trying to make him jealous (he is lol) and was going all about how Neuta should give up on him and stop liking him but then Neuta ignored him because he's also pissed at him and Jigu got sad lol I feel so bad for him it's not his fault that he's an idiot
Yeowoon would have been such a great aroace representation if BLs knew anything beyond G in LGBTQIA+ but idc I'm head-canoning him as aroace
big mood same