a mysterious man with multiple identities, luo jia (played by li guangjie), appeared in the city of lankupa, kanguo for brotherhood, and joined the southeast asian gang seven star society alone. he was in crisis but was not afraid of evil forces. under various extreme challenges, he still adhered to justice and sought truth. aaa。 rankupa prison guard bai zhenhe (played by yuan wenkang), born in the private armed forces of governor rankupa, and after retirement, he worked in sipa prison. bai zhenhe and luojia met unexpectedly in xipa prison. after learning that luojia knew her younger brother bai zhen, the two changed from hostility to cooperation. under various extreme conditions, bai zhenhe and luojia's bonds are getting deeper and deeper, becoming brothers of life and death, wandering around the edge of crime and the limit of life, making every effort to break through many difficulties, and constantly approaching the truth. however, a series of investigations and thrilling conflicts have kept changing things. the undercurrent forces are surging with crises. is love sincere? do brothers have their own ulterior motives? constant doubts and trials have put the protagonist in a siege. "a lonely city is alive, and it is born to death." the truth gradually emerges at the cost of paying life at any time...