Ada said in Happy Agents that brain teasers were the first episode.

"Happy Agent" is the first costume drama jointly produced by He Run Film Industry, Huashan Sword Film Culture Media and Bao Beier Studio. It is directed by Bao Beier, starring Bao Beier, Ada, Angel, Bao Wenjing and Jia Ling, and starring Zhao, Chen, Yang Zishan and Zhang Xinyi.

The play tells the story of Niu Dabao, a nobody who lived in Yangzhou during Shunzhi period. He had no choice but to become a member of the undercover of the imperial red gang and fight side by side with the enemy, which triggered a series of ironic stories.