
I'm team taekyung and here are some reasons:
Joowon is a manipulator of emotion and action; A possessive person which may harm one or a loved one. He, himself, may not realize his deeds which increases the liability of being associated as a sociopath.
Taekyung is mysterious due to him concealing his motives. This "hidden" intent may be correlated with a fortunate or unfortunate outcome. The story is only showing signs of decent performance with a hint of mystery but there is a large amount to unravel.
Joowon shown signs of a sociopath; Taekyung gives of an omnimous/mysterious aura. Between the actions of these two, who seems to be the unhealthy individual?

I get how people can see Taku as mysterious, but honestly I think he has always been straightforward with Haesoo. He’s probably associated with the ominous/ or bad vibe bc he doesn’t show every many expressions, but if you go back to chapter 38 he talks about how he has difficulty recognizing/ distinguishing faces which is a classic sign of prosopagnosia, which can make it hard for those that suffer from this to express there own emotions clearly. I know this from experience since I have mild prosopagnosia. But I mean he has shown signs of possessiveness, but I feel like that stems from him seeing the unhealthy relationship between Haesoo and Joowon. Bc yeah Joowon at the very least is a narcissist. He tell Haesoo that he’ll get bored of his relationships bc he thinks he’s the best he’ll get, and when it looks like Haesoo is trying to move on with someone else Joowon throws a fit
I had a crush like him. similar in size and cool even thought i was taller, i really wanted to be around and i couldnt help but act all shy and nervous.
Sorry, I meant to upvote (´;ω;`)