After the owner of the script-killing shop Hu Die accidentally fell, she became the heroine of the script, Butterfly, and got a loyal guard Jian Lin, but found that this was not the script she wrote at all! She must save Jian Lin, who was full of resentment because of too many script changes, and return to the modern era. Hu Die led Jian Lin to search for evidence step by step, but triggered one case after another. After experiencing pursuit, protection, jealousy and other experiences, the relationship between the two quickly heated up. As the investigation deepened, the true identity of Jian Lin was accidentally unlocked—the posthumous son of the city lord. The conspiracy and truth behind it slowly emerged in their investigation.