A drama about three brothers who reunite after 20 years through twist of events, ever since the death of their parents from two decades ago.Jang Dong Soo the oldest brother become a detective, while Dong Chul the middle brother uses an alias name Heo Young Dal to become the boss of a crime gang. The youngest, Dong Woo, grows into a cold person after being adopted by a rich family.
Kim Sun Woo, who spent his school days as a troublemaker, decides to make a change in his life and joins the sea special attack team, which is called Poseidon. Sun Woo works as a promising commando, but he unexpectedly becomes entangled in an unsavory incident after 2 years. He is demoted and is sent to a maritime police office in Gunsan city. Sun Woo's passion cools down and he slowly loses his vision as a maritime policeman. Then one day, Jung Ryul, who has formed a new crime investigation section in Incheon city, visits Sun Woo and asks him to join the team...