Choi Sung Eok is a retired detective. He lives with his wive in an old apartment. He has financial difficulties, because he put all of his money into his son's business. Choi Sung Eok needs to work again to cover his living expenses. He takes up a job as janitor of shopping building. Due to this, he comes face to face with Park Yong Goo\. In the past, Choi Sung Eok arrested Park Yong Goo multiple times.