I agree w seungho, but taejoo has been interested (romantically) since pretty early on the manhwa and also i don't think he has ever stooped as low as both seungho and jk (but that's just my opinion)
Bro raped the MC on the very first chapter, blackmailed him, threatened him, forcefully kept him by his side and kept raping him and the list goes on lmao if you think this is not stooping low then I dunno what to ya lmao.
The only difference is jjk is an asshole and has shown almost no romantic interest towards the MC. His emotional intelligence compared to senugho and Taeju is zero and he doesn't have a charming personality like them so they get away with it and he doesn't.
I see some people are having difficulty in imagining a redemption arc for Jaekyung well all I'm gonna say is if that Painter of the night dude Seungho and that Taeju from Low tide in twilight can get their redemption so can Jaekyung lmao cause trust me both mfs were way more horrible than Jaekyung is rn lol. I just hope mingwa executes his redemption arc well (which I believe she will).