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。
In the heart of Qingdu City, a strange partnership takes shape between fire investigator Yu Tong and detective Lin Yao Yao after a string of odd fire incidents. They team up after a spontaneous combustion at a university campus, and soon, they're diving into a bunch of puzzling fire cases. With Yu Tong's special four-colour vision and Lin Yao Yao's sharp detective skills, they tackle the human dramas and social issues behind each fire they investigate.
As they unravel the truth behind the fires, Yu Tong's hidden intelligence and grudge-filled past come to light, challenging Lin Yao Yao's by-the-book approach. Their differences cause tension, but as they learn more about each other, especially Yu Tong's painful history, they come together to seek justice. They face their own demons and uncover some shocking truths, including the surprising revelation that Yu Tong's girlfriend's brother is their ultimate foe.
