Song Ye rushes to Jiangcheng to search for his elder sister Song Xue, but gets entangled in a construction site murder case covered up by Sunset Group. Relying on his solid hard skills, he is appreciated by Tianlang Security President Tang Ning and serves as the security director. Facing the layers of suppression and pursuit by Zheng Wancheng's forces, Song Ye disregards his personal safety to gather evidence from multiple sources, teaming up with the defected Zheng Xiaoyu and tainted witness Ma Biao to obtain key criminal evidence. Cooperating with the supervision organs, through repeated life-and-death showdowns, he finally brings Zheng Wancheng's gang to justice and demands justice for the wrongfully killed Guo Dahai.