
In the main story it was showed that Siwoo was great as a friend but it was implied he wasnt the best guy as a partner. He clearly is not really into serious relationships, even if he is, he just hadnt met the person he wants to be with. I personally think he was made too perfect in the main story. The side story actually gave him more personality and showed he is not an npc made to be Suha's support only. Suha was also not perfect, Jiwoon also had this toxic trait to him even though he cares about Suha. Yeah, this story was toxic to begin with like you said and the side story only confirmed everyone is toxic in this story.

Nah I didn't mean the rejection part
I actually enjoyed that
I mean the beginning of the whole shit show
When he drugged the red bitch and had his way with him (and proceeded to hook up with Suha's abuser repeatedly afterwards)
I knew he had an attitude but this was too much
The red guy is a piece of shit but I don't believe r*pe is the best way to teach him a lesson
Other than that I totally agree with you
Every single one of them was toxic in their own way so I didn't expect much to begin with
We didn't get redemption arc for the red bastard (yes, I do not give enough fucks to remember his name)
But we definitely got a corruption arc for Siwoo
In the main story, he was the only character I actually liked
But in the side story I changed my mind
I'm not complaining tho, this shit was toxic since the beginning
I knew what I've signed up for
At least the art style was nice