
Yes, Siwon's behaviour is just frustrating. He trusts the Chinese guy (sorry can't remember his name) more than Jinha. Even after the Chinese guy has assaulted the ginger guy whose name starts with D, assaulted Siwon, bullied Jinha for years and now has put up all of those photos around the university of Siwon and Jinha which Siwon ofcourse is blaming Jinha for. He gets into Chinese guys car, spends the night drinking and gossiping with him, then even after the kidnap/honeymoon he gawps at the half naked Chinese guy and let's him cook for him, then apparently enjoys a BDSM session with him too. His behaiour as a kid was selfish and bratty but he was still a child, you would expect a man in his twenties to have matured since then which isn't the case with Siwon who constantly rejects and bullies Jinha and yet has no issue jumping into bed with the Chinese guy. The author should let all the characters mature and progress instead of this stalemate. Why Jinha is being made out to be the one in the wrong and Siwon the poor baby is tedious.

Completely agree. OMG, I'm his age right now, and I can't imagine any person at my age behaves like that (● ̄(エ) ̄●). Tbh, Siwon needs a nanny, not a BF. Anything happens to him now, it's completelyl his fault. Who the hell in the right have blames their partner for their mistakes. I'm like WTF right now... Siwon plays his innocent/ Mary Sue/ pure card for so long. Hallelujah, I'm out ...
My gosh, the author never fails to disappoint me. I really want Jinha to have a new partner now ! I prefer him to have a seme who will care for him, listen to him and teach him how to communicate in a relationship. I want my cinnamon roll to be happy.
For Siwon, at this point, "Frankly my dear, I don't give a damn" ( ft Gone with the wind) about him any more. He can do whatever he wants with that Chinese dude. Seriously, I know this is fiction, and it's totally the choice of the author to pair who with who. Yet, I can't help to imagine his relationship with Jinha in real life. Like who deserves to be treated like Jinha did ?? All Siwon ever did to Jinha lately were blaming him. This relationship is toxic AF. Jinha is the one who gives and never receives anything back. I don't want him to be with Siwon. Their personalities don't match.
After all this conflict, if the author puts them back together, it would be super forced. There is no trust, their relationship is broken. Unless there is a HUGE development in Siwon's character then I accept this. By HUGE , I mean he has to be like a brand new person, or at least 10+ years more mature. I wish Siwon can learn something from the uke (?) in Jazz for Two.
Author really needs a break. Her plot is all over the place. Very typical Korean Romance. I used to bought all the chapters on Lehzin, now I don't even brother to read the free version. I only skim through some spoilers. It's a pity how she destroyed the image for her child in my mind ╮( ̄▽ ̄)╭.