In the early years of the Tang Dynasty, the world was at peace, but there were still evil spirits in the world. The Dragon King of Jinghe was beheaded, and the Shui Waters Tribe was filled with grievances and wanted to avenge to Emperor. The demon master of Dongying used illusion skills to get the most precious treasure, and frequently used illusions to disturb the human heart. For a time rumors in the capital spread, and people panic. In order to protect the peace of the world and the people return to peace, Emperor Tang personally set up the "Royal Dragon Guard" and sent Qin Shubao to secretly act to capture the enchanting...

Su Cheng returns to his hometown after several years abroad to find his best friend Wang and old crush Lin Jing married and settled down. Cheng's memories of the city reflect a difficult childhood suffering from depression and frequent fights with classmates. Suddenly Wang is found brutally murdered in what police suspect to be one of a series of serial killings over cheating spouses. The killer kidnaps the cheating couple and tortures them before murdering one and leaving the other as a witness. Jing refuses to believe her husband would have cheated on her and desperately searches for answers to his death. At her side, Su Cheng seeks to protect Lin Jing while keeping his own dark secrets at bay. Meanwhile, police suspect Su Cheng may have had something to do with the crimes. Is his return really as coincidental as it seems?