In 2017, the percentage of insurance purchase rate in Korea is 95%. There’s only 5% chance of meeting someone with no insurance plan. Choi Kang Woo is a former detective who works as a private investigator after having his wife and son badly hurt in an airplane accident. Jang Ha Ri used to be a gymnast, but she now works as an investigator for Mag Dog. One day, Kang Woo and Ha Ri run into Min Joon in the midst of a fraud crime investigation.