The story of two detectives who work together to unravel the corruption behind a tragedy that happens within a powerful organization

Jung Han a top murder squad detective in the special investigation bureau of violent crimes becomes the sole guardian of his 6monthold niece Eun Ae when his sister and her husband pass away unexpectedly

Kim Seojin Shin Sungrok is a successful and workaholic construction company director One day his daughter goes missing with no trace Shortly after his wife Kang Hyunchae Nam Gyuri commits suicide due to the shock Han Aeri Lee Seyoung is a hardworking daughter whose mother goes missing in a hospital She then receives a phone call from Seojin He lives one month ahead of Aeri He asks her to prevent the horrific events that destroyed his family and in return she wants him to find her mother

Jicheol is an incompetent husband and dad He was a detective who got suspended for allegedly taking a bribe Cornered Jicheol makes a dangerous decision Having been a boxing champion in the past he decides to participate in an illegal boxing match and take the prize money

Han SeungJoo Uee is a single woman in her mid 30s who works as a PD at a broadcasting station She has a hard time dealing with social prejudices about single women To get the position of a married woman Han SeungJoo marries Oh JakDoo Kim KangWoo who lives in the mountain Their marriage is not based on love but their relationship develops romantically

An AI programmer accidentally develops an AI program called Cho Sang Shin which will identify trashy humans and she uses it to save people who are in difficult relationships