Its bc the author made it seem like ML liked MC for who he was, i mean he really just wanted him to have a happy, peaceful life but Yeomin didnt want it the way ML (forgot his name lol) did it. ML seemed to want him happy by taking all the suffering away from him, but now he's the one that's making Yeomin suffer
I don't know what you've been reading but NO.
Never was there an impression that ml liked mc for himself and only wanted to make him happy.
Go back and read.
When ml realized mc didn't know who he was but was attracted to him, ml decided for the first time to try sex with a man because he was tired of all the women going after his money and trying to become his wife.
And the only reason he stepped in to change things was because it irritated him that he couldn't have mc whenever he wanted him.
Yes ml feels something but right now it's more possession than anything.
This man has a ways to go before it's love.
(I do like the story)

How is this turn of events? Did you guys read a different story? Taeseo was from start like this...not listening to him, coming to his house only when he wanted to crack even if he knew MC feeling...he was very selfish and self centered from the start so this arc suits his psycho personality. Only difference is MC isn't blind to it anymore