Five urban men and women with different personalities, with their own purposes and thoughts due to a lottery, drove to the legendary "Horrible Old Mansion" late at night to participate in a live broadcast challenge and win millions in prizes. In the process, weird events happened one after another. They were in danger in the claustrophobic old house, and they used their wits and courage to find the real murderer, the pretender and the hidden secret passage. Every night of crisis and mutual rescue makes the bond between each other deeper. During the investigation, the dust-laden secrets of the ancient mansion surfaced, and they discovered that they were not only accidental visitors, but also inextricably linked to old cases in the past. Faced with the approaching "mastermind" and strange agency cases, everyone burst into laughter and fear, always facing the end with humor and wit. After the final showdown between good and evil, the passers-by gradually grew up, and their family ties and friendships were profoundly reshaped. Everyone successfully escaped, each quietly transformed, and uncovered the truth of the ultimate mystery.
