The results of a daggering oath causes CIB officer Bobby Au-Yeung to accidentally kill his girlfriend, Esther Kwan. Overcome with grief, his soul escapes and travels back in time to the Song Dynasty, where it attaches itself to the body of Justice Bao Zheng (Bobby). He is surprised to meet an ex-princess (Esther) who looks exactly like his girlfriend. Unfortunately, she gets framed by the evil minister Ben Wong and Bobby, as the famously impartial justice, is forced to execute her. Distraught, his soul leaves him again and finds its way to the 1950s. Bobby becomes a well-known detective and learns that Esther is present in this era as well. However, she does not recognize him and instead accuses him of murdering her husband. While Bobby investigates the case, he inadvertently discovers that the dancer Rebecca Zhu and her boyfriend Pierre Ngo are his parents in their youth. Bobby finds out that Esther's sister (Mandy Wong) has been behind everything. Tragedy strikes once more and Bobby kills Esther for the third time. His soul returns to the modern era. In order to protect Esther, Bobby is determined to break the curse. He searches for the person who placed the curse, but is shocked to discover that he is at the root of the tragedy...