Tae-in, who lost his voice, and Chang-bok make their livings cleaning up crime scenes. One day, they are left to take care of a kidnapped girl named Cho-hee, who was raised to be a kind and caring sister, obligated to take care of her brother in a male-orientated family. She manages to keep calm and swiftly read the situation. Even when she sees Tae-in cleaning up brutal crime scenes, she keeps her calm, acting the "good girl," even taking care of Tae-in's little sister. Tae-in starts to open himself to Cho-hee, while Chang-bok, who was supposed to come back with Cho-hee's ransom, becomes uncontactable. Now Tae-in has to go through the situation all alone.