The Legend of Zu Season 2 Episode 33

Yu Ying Qi and Yu Ying Nan split up to find the butterflies. Qi Ling Yun helps Bai Gu Yi get Huoli people's internal fire, but gets caught by Yu Ying Nan. She lets her go because she tells Yu Ying Nan that killing her will also kill Bai Gu Yi. Yu Ying Nan tells Bai Gu Yi that they can never undo the past and she cannot be with him. Elder Wang decides to solve their problem by finding Xuan Ji Sect. Bai Gu Yi kills a bunch of Huoli people for their internal fire and gets caught by his teacher. Xiao Lang's dad takes him to Xuan Ji Sect to be a disciple. (Source: jindreame at MyDramaList)