
Stealing from your family makes you a bad person. There are a lot of ill people in the world, there are millions and millions and millions of ill people in the world, if those ill people steal from their family than they are bad people as well as ill people.
Having an illness does not make you incapable of being a bad person.

The only character who actually takes proper care of their sibling is Jingi. Myeongil steals, gambles, makes his family's life worse and doesn't stop even when they beg him to. He's been to jail multiple times and used his own kid brother to pass prison notes to dangerous people. Sure, he has basic human empathy, but nothing beyond that. The only reason he's actually thinking about being a good person and getting a job after prison is cause he got mega raped and then his rapists pitied his dumbass so much that they taught him how to read and write.

Youre putting words in my mouth, I havent said being ill makes you unable to be a bad person, I just pointed that it was an illness because you seem to talk very lightly about addiction, like he wants to ruin is family and all. He doesnt want to, he does it and its bad but its not out of malice. And we can just agree to disagree here because I wouldnt qualify him a bad person still
Someone can do bad things and not be a bad person while someone can do great things and not considered a good person thats all

I never spoke lightly about addiction and I never attributed malice to his actions.
You are what you do. The actions that you take make you who you are. If you do bad things then you are a bad person. Bad people can learn to be better, bad people can become good people. Redemption is a beautiful thing that happens every day.
But he's still very much a bad person at this point in the story. I fully believe he'll have a redemption arc, but at this point he's just considering changing and hasn't actually changed. He still gambling and stealing. He still abusing his siblings. He's still hurting his family.
I wish at least one of the three main characters was a good person.