The office worker Shu Shu transmigrates into an immortal-cultivation novel as the tool treasure-seeking rat. Just after transmigrating, she is surrounded and hunted by the original novel's female lead Wen Jianxi. At a critical moment, she is rescued by Liu Yu, the sect master of the Liuliu Sect, and taken in as the closing-door junior sister. The master sect appears to be a villain den, but in reality every member is a great demon—eldest senior brother Lu Li is a direct-line phoenix, and everyone dotes on her. Wen Jianxi carries an evil immortal artifact spirit all the way to snatch opportunities and frame the Liuliu Sect. Relying on her treasure-seeking talent, Shu Shu helps the master sect resolve crises, finally breaks into the core of the heavenly dao to sever the pseudo-destiny, joins forces with the master sect to defeat the evil immortal, re-establishes the mountain gate of the Liuliu Sect, and transforms from a fear-of-death little rat into the junior sister guarding the master sect.