Designer M.A.C. (played by Ady An) disregards her partner's objection and confesses her orphan identity to the media. In addition to hoping to be honest with others, she has never given up the desire to find her biological parents. With the help of the orphanage, M.A.C. finds the old house that was demolished, and thus gets to know Zhong Ge (played by Jiro Wang) who works on the construction site. Under Zhong Ge's guidance, M.A.C. visits the mute grandmother who is waiting for her family's relics, but does not get any clues about her origins. However, strange things soon follow one after another: her parents are likely to be from a tomb-robbing family, the captain of the work team may have bad intentions, and the grandmother seems to have died long ago... The mystery is gradually revealed. It turns out that Zhong Ge is also an orphan from a tomb-robbing family. In order to find clues about his parents, he tries to find a book called "Secrets of Tomb Robbery" among M.A.C.'s relics. In order to achieve his goal, he does not hesitate to use the tools and drugs left by his parents to create kidnapping incidents. He firmly believes that he is not a bad person, but his actions gradually get out of control...