In the 1930s, the Flower City of Guangdong was a place of chaos, and Lin Hao, the chief instructor of the mysterious organization 'Black Edge,' faked his death during a mission to escape its control. He hid himself in the outskirts of the city at the Wu family clinic under the guise of a doctor, intending to start a new life. However, various encounters once again pulled him into the center of the vortex. During his time as a physician, Lin Hao crossed paths with the rebellious rookie female police officer He Xinxin, and his true identity raised her suspicions. As multiple cases unfolded in Flower City, Lin Hao and He Xinxin grew closer, their feelings intensifying through mutual probing, while the connections between the cases pointed towards a conspiracy involving a plague case from twenty years ago, which also hid the mystery of Lin Hao's origins. The truth was imminent... Lin Hao decided to step forward again, joining forces with his girlfriend He Xinxin, the head of the Flower City Chamber of Commerce Zhuan Yu, the returning Western medicine young master Zeng Fan, the stunningly skilled female assassin Leng Yuehan, and the clinic nurse Wu Ruolan to uncover the truth. However, their opponents lurked in the shadows, powerful and relentless, like a black hole threatening to pull them into a deep abyss.
