In the summer of 1997, Jiangcheng criminal police officer Lin Xiao was ordered to infiltrate a transnational drug trafficking group under the leadership of "Uncle Long", the number one drug lord on the southeast coast. In order to gain trust, he had to get involved in the darkness step by step - personally enforcing family laws, participating in the drug trade, and watching his brothers die trying to protect him. What's even more fatal is that his wife, policewoman Su Wanting, approached Uncle Long in order to cooperate with the operation, but unexpectedly discovered that the other person was the person who changed her fate back then. The old feelings were rekindled at gunpoint.
Chen Qingzhi, the group's second-in-command, is Lin Xiao's most trusted brother in the dark and his most dangerous enemy in the light - because Chen Qingzhi's true identity is an undercover agent sent by another system.
When the two discover each other's trump cards, a card game about loyalty and betrayal officially begins. Should we work together to break the situation, or destroy each other? When Su Wanting became pregnant, even she herself didn't know who the child was - no one could walk out of this endless hell innocently.
