Chen Haisheng takes the place of Li Dayong, a missing lifeguard, at a seaside tourist attraction. Although he cannot swim, on a typhoon night he uses a nylon rope to rescue a child who has fallen into the water near the reefs. He goes from being a fake temporary worker to an ordinary hero celebrated across the internet. But when the secret that he has been working without a license is exposed, online harassment, public doubts, and workplace bullying follow one after another. With nowhere left to turn, he discovers that Li Dayong's disappearance is connected to a major maritime smuggling operation, and that people are being held captive for long periods in the lower compartments of fishing boats. Defying the pressure, Chen Haisheng steps forward to report the criminal scheme and expose the illegal activities. In the end, he earns his certification, officially joins the team, and becomes captain of the lifeguard squad. Through his pure kindness, he achieves personal redemption and brings peace and safety back to these waters.