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Wu Yan Zhu, a trainee doctor in the real world, who accidentally broke into the world of the comic "W", drawn by her father Wu Cheng Wu, met the comic actor Jiang Zhe, and a series of thrilling events and sweet love story begins.

After aimlessly hopping crime scenes for five years, detective Kang Cheol-jung (Sol Kyung-Gu) hands in his resignation in the face of major financial burdens. His chief, however, asks him to stay on until a high school murder case is closed. At first, it looks hopeless, but then Kang finds a fingerprint lead, and later learns that three of the dead student's friends are employed by a single company. He begins to investigate the group and its leader, Lee Won-sul (Jeong Jae-Yeong). -asianmediawiki

A series of murders occurs in a city, committed by a mystery man named Jiang Ya. He regards himself as the "city's light", taking matters into his own hands by killing off criminals. Police investigator Fang Mu is tasked to investigate the identity of the murderer. Together with forensic fingerprint expert Mi Nan, they set out to solve the mystery and fall in love in the process