What plot? It did fall down the cliff with Siwon back then and died.
It died the moment Siwon found out about his own feelings. That's when it dragged on and the author lost control and added a shit ton of crap to make the story longer.
Apparently he forgot about his feelings for Jinha, he should just let Jinha die or let him date this dude he met at the club. If he wasn't sure about his feelings for Jinha, but no let's lead Jinha and saying he is at fault for everything what happened to Siwon. Love such characters.
Dunno, some are saying Waje wasn't allowed to end this crap sooner because it got pretty popular.
So, some corporate shit.... fucking corporate dickfuckers.
This whole plot is getting out of hand....