One morning, an APP called "Judgement" appeared on everyone's mobile phones at the same time. The APP only displays one rule: you cannot lie to anyone. Violators will have an invisible number - a mark - appear above their heads. Anyone with a mark of 3 will be "purged" at midnight: erased from existence, and everyone will forget that you were ever alive. Former detective Mo Shen discovered that he could see the marks on other people's heads. He originally wanted to live as a transparent person until the end, but when a young man was about to be cleared, he chose to stand up. He discovered that marks could be transferred—transferring someone else's mark onto one's own. The price is memory. Every time he saves a person, he forgets a piece of the past. When his memory is about to be cleared, he faces the final choice: protect everything he remembers, or forget himself and let everyone live?
