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 kindhearted sister, obligated to take care of her brother in a male-oriented family. In fact, she was abducted instead of her brother, but because it has always been obvious to stand in for her brother, she manages to keep calm and swiftly read the situation she is placed in. Even when she sees Tae-in cleaning up brutal crime scenes, she keeps her calmness, acting the “good girl” inside her, even taking care of Tae-in’s little sister. Tae-in starts to open himself up to Cho-hee, while Chang-bok, who was supposed come back with Cho-hee’s ransom, becomes out of contact. Now Tae-in has to go through the situation all alone.