Zhengdao, a retired special soldier, took off his military uniform and became a community security guard in a third-tier city in order to fulfill his last wish of sacrificing his comrades. He is very skilled, but reserved and low-key, and just wants to live an ordinary and stable life. However, there is an undercurrent surging in the old city where he is located - Feng Tianba, the owner of the Longteng Martial Arts Gym, is a violent and ruthless person. He uses his hard skills to run rampant in the countryside, collect protection fees from surrounding shops, and fight with fists and kicks if he disobeys. The martial arts students who resisted a little were beaten and disabled.
By chance, Wei Zhengdao witnessed Feng Tianba's disciples beating an old man running a stall in the street. The old man had a bloody head and was still forced to kneel down. He couldn't bear it any longer and used three moves to repel the thugs. Feng Tianba was furious after hearing the news and led people to surround and retaliate. At a critical moment, the long-dormant "Justice Value System" in Wei Zhengdao's body was accidentally activated - this was an experimental chip implanted during his days as a special forces soldier. Every time he did something to eliminate harm for the people, he could gain an improvement in martial arts and unlock practical skills.
Since then, Wei Zhengdao has changed from being forbearing to taking the initiative. He is an ordinary security guard during the day, and turns into a street warrior at night. His punches and kicks are all actual combat killing moves, and Feng Tianba's forces are retreating steadily. Unwilling to be humiliated, Feng Tianba colluded with underground black boxing bosses and overseas fugitives to set up a killing trap. With the help of his girlfriend, forensic doctor Lin Xue, Wei Zhengdao peeled off the cocoon and revealed the greater evil behind Feng Tianba: illegal fighting casinos, human trafficking chains, and even arms transactions in collusion with overseas mercenaries.
