You need to read the story again and more carefully.
Dan is suffocating with the gifts and doesn’t like Heesung. When he is with Heesung he is thinking about Jaekyung. Dan has fought against his boss and loan sharks trying to rape.
I am scared of what will happened at Heesung’s place but it is not because Dan feeling obligated. It would because he says no and Heesung continues to get at Jaekyung. Dan always found Jaekyung attractive and he is starting to fall in love. Heesung may get him to understand his feelings or accept them.
I can see your interpretation but please look back at the story. If he does accept out of being obligated that does go against what she has set up already.
I know what you mean about Dan's feeling towards Jaek but I don't know how big of a role they play in this scenario (though I love your idea of Heesung making Dan realise he has feelings for Jaek )
The loan shark thing is diferent imo. That was pure violence and aggression but with Heesung it's diferent because he is Nice to Dan which makes Dan feel indebted to home. Sorta like he felt indebted to Jaek after he saved him from the loan sharks and gave him a place to stay, he felt like he had to do a better job because of how much Jaek done for him.
Though now that I think back to the very begining, when Jaek first called Dan to his apartment and proposed to have sex, he refused at first. So maybe there is hope
Yeah, Jaek is a jerk, he been knew. He is just acting up cause he is jealous and he doesnt recognize the feeling so he is taking it out on Dan.
Im more scared of what will happen at Heesung place. Im afraid that If he pressures Dan into sex, living Dan's nature he will feel obligated to say yes.