I prefer Taku, but I get what you mean. Usually with stories like this, the really kind and calm love interest pulls some dark shit at some point. It’s kinda like Taku goes after Haesoo since he’s such an easy target (his emotional/mental state is very fragile) but then again he doesn’t have much motive so probably not what’s happening. This might turn out like hogu hagyeongsu where Haesoo is wronged by both of them and just ends up alone. I hope not cus Taku and Haesoo are fucking adorable.
I hope one day Taku becomes someone you think is trustworthy and not give you the feeling of bad vibes. He seems sincere right now but after all that's happened to Haesoo, I think it's easy for wary fans to keep their guard up and not trust anyone who might take advantage of him at his lowest point.
I’m really sorry for this but... I actually prefer Joowon and I ship him with haesoo... sorry man but Taekyung gave me bad vibes and he make me uncomfortable.