Responses
Yea... And also as revenge for feeling betrayed. That he thought something romantic was between him and won when won was actually in love with jinha and used jinseo as replacement. Like he said, he hopes that won never finds happiness. But I think the biggest part is that as well, that no matter what he does, won will never look at him

Neither of them really gave a shit about the brother huh
Also...the brother ended himself cause he realized won would never love him right?