Gu Yanchen, an innocent girl who looks harmless, smiles like a soft little puppy. She works part-time in an ordinary coffee shop, and her biggest worry is whether she should drink strawberry milk tea or caramel macchiato today. No one knows that she is actually the "codename Mianhu" secretly trained by the National Security Agency - a top agent who once single-handedly destroyed transnational criminal organizations. After that mission three years ago, she chose to retire and just wanted to be an ordinary person. However, the peaceful life was broken by an encrypted message: the leader of the criminal group she sent to prison, "Ghost Hand", escaped from prison and was looking for the person who betrayed him. To make matters worse, Ghost Hand's strategist, the insidious and cunning Ling Luo, pretended to be a new neighbor and moved in next door to her, and began to test her identity step by step. Gu Yanchen had to maintain his role as a naughty dog while also dealing with the many traps set by Ling Luo. When she discovers that her favorite milk tea shop owner, courier boy, and even the man walking the dog downstairs may be Ling Luo's spies, the crisis of identity exposure is imminent. And her biggest cheat, the "causal retrospection" system, can give her three seconds to do it again before each exposure, but it can only be used three times a day. This time, can she continue to pretend?
