When he woke up, the intelligence expert of the modern National Security Bureau became the concubine of a down-and-out prince in the Tang Dynasty. On the surface, he is a poor candidate in the imperial examination; secretly, he is the controller who restarted the "Jing'an Division", the former government's secret espionage agency. When the truth and conspiracy are intertwined in the prosperous era of Zhenguan, he will use his dual identity to light an eternal lamp for this era.
