
Btw Jitae has some really good (sad) expressions, like in chapter 3 when Mieum asked him if he needs "help" (He looked so hurt, probably because Mieum did not remember him, but was willing to sleep with him to do his job), or in chapter 23 when Mieum asked him if it hurts when he sees Mieum , and he said no T_T but you could see that he was hurt

Before everyone jumps on Jitae, he is definitely lying, to save Mieum. He knows that Hajoon hates Mieum and that Jian just wants to use Mieum, so he needs to show that he doesn't care about him.
Also if you remember Mieum has never asked Jitae for money, he tried to work quietly, and after getting exposed as a spy, it was Jitae who offered him to help find his dad. But here Jitae says that Mieum wants money (while what Mieum wants is to find his father,and it was Jitae who first offered to help him).
And in the end he says "that's why I'm going to stop". My theory is that he is saying that he is going to stop coming to the bar (for prostitutes) , because he wants to "play" with Mieum (while we know that he loves Mieum and wants to stay with him and do it with him only, but if he doesn't go to the bar, they will suspect something)
One of my favorite manga, I even bought the physical version T_T