Li Yuan's grandmother accidentally learned the secret of Shen Yao, the prince of Beijing, after picking up a diary discarded by him. She died mysteriously soon after, while Shen Yao was at large. In order to seek justice, Li Yuan gave up his established future and sneaked into Shen Yao's world under a pseudonym. She dealt with Shen Yao, his Bai Yueguang Lin Qingyue and her illegitimate brother Shen Zhuo, spending four years carefully planning, step by step. She cleverly created a wedge and caused Shen Yao's alliance to fall apart; she secretly planned and guided all parties to expose the evidence of his crimes one by one. Finally, on the wedding day of Shen Yao and Lin Qingyue, the police took him away at the scene with conclusive evidence. Shen's business empire collapsed.
