You haven't seen anything yet. Dong Hyun is going to take Kungsoo to Yule and put a knife to Kungsoo's throat and threaten to kill him unless Yule kills himself. And Yule is actually going to stab himself, later get admitted to a mental hospital, and Kungsoo and Dong Hyuk are going to become lovers. So at that point, everyone is actually fucked up and Killing Stalking is gonna look tame in comparison.
Would appreciate a spoiler alert #－.－)
Don't worry though half of that spoiler was wrong and didn't happen in the story spoiler alert
Kyungsoo and Donghyuk never end up being together and Yul doesn't get admitted to the mental hospital
Thank you :)
and here though dong boy was kind of normal looks like he is going to fip to the yandere mode