The drama tells the story of fire investigator Xu Tongsheng, who is determined to uncover the truth behind an old case involving his family. In the course of his work, he reunites with his childhood friend, forensic doctor Xin Chun, and criminal investigation deputy captain Shen Ye. The three collaborate to establish a rapid response mechanism for major fire incidents and work together to solve a series of mysterious fire cases, ultimately uncovering the truth behind the Xu family’s old case.