i think the author handled the resolve of the possessive traits in taeyul badly. it got really bad and abusive and then all of the sudden he was better? they kinda just swept it under the rug when in reality if the mc does anything to make taeyul not trust him those traits may show up again...
But low key possesiveness gives TAEYUL more character in the story. We can see how wreck he was but decided to love again. He had a trauma we can see he was trying his best to let Soohan be trusted because he knew what will happen. But anyway, LOVE WINS in the end.
when i saw that weirdo i exclaimed my disgust out loud. what happened to him? he looks as if a dozen rats just mauled him and ripped his clothes...
Lmaoooo