Love Better Than Immortality Episode 18

Fu Lou and Chief Leng continue their investigations on Master Shi. As Cai Cai's health continues to deteriorate, Chun Hua stays with Qiu Yue, looking for ways to get the antidote from him. She finds the hidden chamber with the poisons and tries the Three Day Drunk concoction on Qiu Yue, to allow her to get information on the antidote. However, Qiu Yue knows Three Day Drunk is missing and that he had previously replaced it with an aphrodisiac. Chun Hua continues to lie to get the antidote from Qiu Yue. (Source: frankly at MyDramaList)