In Blossom Season 1 Episode 13
Trapped in the dungeon where Gu Yong kept his son, Gu Shan, Cai Wei, and Pan Yue barely make it out alive when Gu Yong fills the room with smoke. They decide to resume the Lantern Festival to force Gu Shan out in the open. Assassins go after Master Zhuo and Xiao Sheng.