iQiyi crime thriller Who Is Murderer 谁是凶手 comes from director Sun Hao (Joy of Life, Bad Guys Must Die) and stars Xiao Yang and Dong Zijian as police officers and Zhao Liying as a doctor. Initial sources reported the drama as an adaption of the Baiyin Murders. The original synopsis is translated below:
In 2006, rookie police officer Leng Xiaobing (Xiao Yang) comes face to face with the serial killer responsible for the rape-murders of eight women. However, he is unable to fire, and the killer disappears from sight. Ten years later, police academy graduate Xia Mu (Dong Zijian) joins the local detective team. Unbeknowst to most, Xia Mu is the sole witness of the last murder, and suddenly, all the clues begin to converge.