Zhao Yunlan is Chief of the Special Investigations Department: a secret group of uniquely skilled individuals who investigate strange happenings in modern-day Dragon City. Although laid-back and cheeky to those who don't know him, this tenacious and cunning man fits well into his role of the Guardian.

While investigating a mysterious death at a local university, Zhao Yunlan meets Shen Wei, a calm and cold professor who proves as intriguing as the case itself. Something about this reserved man feels strangely familiar. Zhao Yunlan can't help but notice the intensity of the professor's gaze, and wonders why their lives begin to intertwine—as if by fate.