Well, now it's clear that Sunbae isn't really into him. For Sunbae, it will be just another relationship that get boring over time. So yeah, MC didn't trust him is a justified reaction with the way Sunbae treated him so far; first interest only for sex, now he only cares this much because he thinks he likes MC and that feelings alone easily fade aways. Sunbae isn't interested or needed him that much. Even if Sunbae can help MC with the other world problem, as the Shaman said, there's no guarantee that Sunbae will be with MC forever. Sunbae too, shouldn't be offended if MC didn't give him trust as just like this, his feelings easily burn over as MC still not choosing him.
MC is a supposedly a dead man. He'll face lot of complications with the other world. The entity can't live without him and able to offer him safety. They're made for each other. MC need safety and the entity need MC to live. Unlike Sunbae who can just walk away, The entity is bonded with MC. MC just need a better communication with the entity about how they're going to life. No more manipulation even if that 'best' for MC. Form a healthy relationship.
Well, now it's clear that Sunbae isn't really into him. For Sunbae, it will be just another relationship that get boring over time. So yeah, MC didn't trust him is a justified reaction with the way Sunbae treated him so far; first interest only for sex, now he only cares this much because he thinks he likes MC and that feelings alone easily fade aways. Sunbae isn't interested or needed him that much. Even if Sunbae can help MC with the other world problem, as the Shaman said, there's no guarantee that Sunbae will be with MC forever. Sunbae too, shouldn't be offended if MC didn't give him trust as just like this, his feelings easily burn over as MC still not choosing him.
MC is a supposedly a dead man. He'll face lot of complications with the other world. The entity can't live without him and able to offer him safety. They're made for each other. MC need safety and the entity need MC to live. Unlike Sunbae who can just walk away, The entity is bonded with MC. MC just need a better communication with the entity about how they're going to life. No more manipulation even if that 'best' for MC. Form a healthy relationship.