In the tension-filled thriller, Ma Shan (Wen Jiang) finds himself in a precarious situation when he wakes up after a night of heavy drinking at his sister's wedding reception to discover that his firearm has gone missing. As panic sets in, Ma Shan embarks on a mission to track down his stolen weapon, knowing the grave consequences that could result from its unauthorized use. However, the blur of the previous night leaves both Ma Shan and his friends struggling to piece together the events of the wedding, with no one able to recall who drove him home. The stakes grow higher when Ma Shan's ex-girlfriend unexpectedly returns to town, only to turn up dead with bullets that match those fired from his missing gun. As the mystery deepens, Ma Shan must navigate a web of deceit and betrayal to uncover the truth before it's too late.