
The sister is so weird, she knew he was in love with his brother but insisted on the marriage and even now she consistently wants to be the victim when she knows that her brother has no idea that the uke already told her about his love for her brother.... just because your love didn't work out doesn't mean you can just pit the blame on your brother
You knowingly brought this on yourself.
"Oh you guys are not dating right" yeah girl sure
1. Seung could have been more honest with his feelings instead of lying, but I think he's got a bit of an inferiority complex or whatever. Yeah, him going to Mujin for comfort could have been the worst decision and he knew about Mujin's feelings for him and knew that he wouldn't reject him.
2. Dogyeom had always slept around, which I can see contributed to Seung's indecisiveness.
3. Mujin is a love brained fool, he knew Seung didn't come to him out of love and he also could have seen this not going well, but he still let his unrequainted love for Seung win over his rational thoughts.