One middle aged women is admitted to the hospital in a coma. Yeon-hee, who has been searching for a heart to transplant to her daughter, who has critical heart disease, is begging middle aged women's gangster son, Whee-do, by giving him a fortune. But when the reasons for Whee-do's mom are revealed one by one, Yeon-hee, who became desperate, is teaming up with dangerous people.

The little siblings Ji Ho and Seon Ho live on their own without a protector. They lost their mother to a hit-and-run accident and their father has been wandering all around the nation trying to catch the culprit. But they valiantly live every day loving each other. One day, they receive a phone call from the police station, which makes them misunderstand without a second thought.

An honest cop has to compromise with his principles when he is told to find a scapegoat for a high-profile serial killer case in exchange for a big promotion.