Lin Yan, a retired security guard, hid in the southwest border and opened a "Shou" self-defense gym. He adhered to the creed of "defend without injuring" and just wanted to die in the smoke of fireworks. However, the tranquility was easily crushed by the gangster young master Zhao Xiaotian - the martial arts gym was smashed, the commemorative pocket watch was destroyed, the beloved cat died tragically, and the star and moon pendant left by his late wife was taken away. The repeated provocations crushed Lin Yan's last bottom line. When concessions become meaningless, the "sharp edge" that has been dormant for three years comes out of its sheath again. Lin Yan single-handedly fought against the entire Gray Empire, from lone raids to undercover evidence collection, from street fighting to factory showdowns. Not only does he want to regain what belongs to him, but he also wants to uncover the truth about the ambush that ruined his reputation three years ago. With the involvement of various forces including criminal policeman Li Ran, teahouse owner Hong Jie, and retired senior official Zhou Jianming, a criminal network spanning smuggling, firearms, and criminal police gradually emerged.
This is a story about tolerance, revenge and redemption. Lin Yan used the most restrained means to complete the most thorough liquidation, and found his own answer between guarding and killing: the blade returns home, not disappearing, but waiting for the next time it is needed.
