Cheonsa is transferred to a juvenile rehabilitation center after taking the fall for someone else or defending herself. Seongje has already been there long enough to know every blind spot, every guard, and every rule worth breaking. He’s loud, aggravating, and impossible to ignore, while Cheonsa is quiet and emotionally withdrawn. He keeps pestering her simply because she doesn’t react the way everyone else does. Eventually, his constant presence becomes the only thing pulling her out of isolation