Question: Who directed the Chinese comedy film in which Yang Zishan's performance won her the Best Actress award at the China Movie Channel Media Awards?
Sentence (from "20 Once Again"): 20 Once Again (Chinese: 重返20岁 "Chóng fǎn èrshí suì") is a 2015 Chinese comedy film directed by Leste Chen and starring Yang Zishan, Gua Ah-leh, Bolin Chen and Lu Han.
Relevant evidence: Yes