It's honestly very realistic to young relationships. The one with the glasses was very mature for his age, but the blonde one's actions make so much sense for an anxious teen.
It is kinda annoying, but it does fit the characters age well. The insecurity of "He looks so much better with her." is also a big thing with young LGBTQ+ couples since they are still figuring out their sexuality and how it can affect how others view them and how they view themselves.
Overall, good art and a potential good story that is overshadowed by how fast paced it is.
I think the reason he left the money behind is to appear more scary in the eyes of the bad guy. It kinda shows that he's willing to do anything for Seo (that includes beating the shit out of that dude since he fucked around and found out). Mr. Kwon is rich af, that money probably is a small amount for what he has, and if Seo is offering to pay it back, he'll have an excuse to keep him close.
A lot of people are commenting the "issue" of him leaving 1Billion won behind, but the mf of Mr. Kwon is willing to tear down his grandfather's business for shits and giggles (not really but you know what I mean). He is so rich that money means nothing to him.
The art is so pretty, but why is a full grown man hanging out with a teenager?
i feel u i was like eeeeeeeee nope