Responses
The problem isn't just lack of bravery... It's his lack of self-esteem. He probably feels like he's the worst because he's been "freeloading" for years now at a friend's house, and when you've grown up seeing yourself that way, it's hard to separate between the people you are actually indebted to and the others who are just assholes...
i hope one day Haebom would be the one to stand up for himself, not Taesung, he should give him he chance to be brave