In the lawless 1980s Kowloon Walled City, an aspiring student and a triad enforcer find an unlikely, dangerous love while fighting for their lives.

Retired ballet artist Tan Siting returns to China, wanting to seek a second chance with Feng Rui, the lover she was once forced to leave behind. But past misunderstandings have built a wall between them. Feng Rui's orderly life as a a single father is thrown into chaos by her reappearance. Meanwhile, Tan Siting is accompanied by a man who has loved her from afar for a decade. As Tan Siting and Feng Rui try to avoid each other, fate keeps forcing them together, leaving them trapped in a turbulent mix of love and heartache.

Detective Sun's pursuit of murders linked to his father's shooting uncovers partner Chu's secrets and Chief Gao's trap to reveal long-buried truths.