Retired gang member Gang-pil tries to find another job rather than running an illegal inquiry agency in order to win custody of his daughter back. In order to pay for the lawyer, he accepts LEE Mun-hee's request to follow the entrepreneur PARK Yong-dae, but soon after both PARK and LEE go missing, Gang-pil starts digging in.
Retired gang member Gang-pil tries to find another job rather than running an illegal inquiry agency in order to win custody of his daughter back. In order to pay for the lawyer, he accepts LEE Mun-hee's request to follow the entrepreneur PARK Yong-dae, but soon after both PARK and LEE go missing, Gang-pil starts digging in.