Zhen Guan Zhi Zhi, also known as Control by Zhen Guan, is a Chinese television series based on the events in the Zhenguan era during the reign of Emperor Taizong of the Tang Dynasty. The 50 episodes long series is directed by Zhang Jianya and written by Ah Cheng and Meng Xianshi. It was first broadcast on BTV in China in December 2006.