mostly because the title kept bugging me—what does 'decent' even mean in that context? Turns out it's a pretty core part of the setup, which I guess is obvious to everyone else. Anyway, you've got the main guy, Kang Tae Ho. The story's told from his perspective, and he starts off as this incredibly bitter, cynical man whose life is basically ruined. He decides to get revenge by ruining another family, the one he holds responsible for his downfall, which is the 'decent family' in question. His whole motivation is so dark and petty at the start, and watching him navigate that mess is the central hook.
Then there's the family he infiltrates. The patriarch is Baek Do Jin, the CEO whose company Tae Ho blames for everything. Do Jin's got this polished, respectable exterior, but the story slowly chips away at that. His wife, Yoon Hee, and their son, Baek Hyun Woo, round out the immediate family unit Tae Ho is trying to dismantle from the inside. But the character I found myself paying more attention to was Lee Soo Yeon. She's not part of that core family, but she's deeply connected to them, and she becomes this major point of conflict and, weirdly, potential redemption for Tae Ho. She's sharp and sees through a lot of his act way earlier than anyone else, which creates this fantastic tension.
Honestly, the dynamics are less about any one hero and more about this web of resentment and hidden motives. Even the 'decent family' members have their own secrets and flaws, which makes Tae Ho's mission way more complicated than he planned. I kept waiting for him to have a clear-cut enemy, but the lines are deliberately blurred, which I think is the story's strength. The key characters are really defined by how they orbit and clash with Tae Ho's destructive plan.