When did Bai Yue know that Xiye was a ginseng?

The eighth episode. In the eighth episode of Wulin Chivalry, Nishino introduced himself to Bai Yue, indicating that he was a ginseng essence. Chivalry in Wulin is a love drama in ancient costume directed by Donnie Zhu, starring Li Hongyi and Huang Riying, starring Zhu Zanjin, Zhang Xinyan, Li Xingchen, Wang Xinqiao, Jiang Peng, Sun Hao and Cui, and especially starring Qi Peixin.