Leaning on each other through thick and thin, a trio of best friends stand together as they experience life, love and loss on the brink of turning 40.

A mystery psychological thriller drama that depicts characters with various desires and different psychology, and their tangled relationships against the backdrop of a society that conceals their dark sides and is maintained through someone's sacrifice.

Lee Tae Kyung is a star lawyer with the best win rate. He is able to win cases by using his sharp logic and intelligent speeches. He amasses power and wealth by dealing with clients who are part of the elite class. His cases are usually referred from Song Woo Yong who is the owner of a construction company. Lee Tae Kyung gets these high class criminals acquitted or at minimum receive probation. He first became a lawyer to get revenge for his younger sister, but has since become focused on money. He changes when he deals with a series of cases involving missing actresses. Meanwhile, Song Woo Yong has grown his construction company by funneling criminal cases involving wealthy people to Lee Tae Kyung. For his family, he desires even more power. He comes into conflict with Lee Tae Kyung over the cases involving missing actresses.

A detective thinks about quitting his job. He takes on a female university student murder case that was disguised as a suicide. The detective becomes obsessed with solving the case. He has a young sister and she meets a man. The man does not remember when he was little. He is not a good person, but she has sympathy for him. The detective tries to push the man away from his younger sister. The detective suspects that the man is somehow involved in the female university student murder case. The man and the detective's younger sister fall in love.