青都市消防支队的火灾调查员俞瞳，初上任就遇到离奇的湖中自燃案，用高超的火场调查手段震住了协同调查的天才刑警林耀耀。两人性格迥异却又必须联合办案，自此携手侦破多起火场奇案。随着彼此了解的加深，俞瞳表象之下的另一面也开始浮现，深埋在他心底的一桩陈年旧案被再度挖出，令人惊愕的真相逐渐浮出水面。

Yu Tong, a fire investigator with the Qingdu City Fire Brigade, faces a perplexing case of spontaneous combustion in a lake on his very first assignment. His exceptional skills quickly catch the attention of the brilliant detective Lin Yaoyao. Despite their contrasting personalities, they must work together to unravel a series of mysterious fire incidents. As they delve deeper into the investigation, hidden layers of Yu Tong's character emerge, and an old case from his past resurfaces, leading to shocking revelations that will challenge everything they thought they knew.