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?

Context paragraphs:
Nikah (film): Nikah is a 1998 Pakistani film and a remake of the 1977 film "Aina".  The once-again presence of onscreen pair Reema Khan and Shaan Shahid after nearly five years, raised viewers' expectations and made it a much awaited movie of the 1990s. reema gave best performance according to critics and got best actress award at nigar film awards.Reema was considered as the number one actress from 1990 to 2000 in Lollywood because of her superhit films and popularity from more than any other actress in 90s. But critics of cinema considered her as icon of beauty, best dancer and average actress till 98. Her acting talent proved in 98 in sangeeta nikah and syed noor zewar.she got every best actress award of Pakistan for her performance in nikah.This film was considered as classic in cinema of 90s of Lollywood.  This film was also presented in China, India, Sri Lanka film festivals

China Movie Channel Media Awards: China Movie Channel Media Awards (电影频道传媒大奖) are presented at each Shanghai International Film Festival by China Movie Channel.  Voted by the reporters in the entertainment industry, the awards are aimed at "promoting medium-and-small-budget homegrown movies and exposing talented young directors and actors".

China Movie Channel (organisation): China Movie Channel () is a trade name of what is literally translated as the "Film Satellite Channel Programme Production Centre" (), an agency at the Chinese Government's State Administration of Press, Publication, Radio, Film and Television.

Zhong Kui: Snow Girl and the Dark Crystal: Zhong Kui: Snow Girl and the Dark Crystal (Chinese: 钟馗伏魔：雪妖魔灵) is a 2015 Chinese-Hong Kong-United States 3D fantasy action adventure film directed by Peter Pau and Zhao Tianyu and starring Chen Kun, Li Bingbing, Winston Chao, Yang Zishan, Bao Bei'er, and Jike Junyi.  Production began on February 16, 2014.  The film was released on February 19, 2015.

Rebecca Lim: Rebecca Lim is a Singaporean actress who has acted in several English and Chinese dramas produced by MediaCorp.  Lim is best known for her portrayal of Wendy Lim, a trainee lawyer in the Channel 5 television series "The Pupil", for which she won the Best Actress Award at the 15th Asian Television Awards in 2010.  She also won the Best Supporting Actress Award at the Star Awards 2014 for her portrayal as Lisa Xiao in "The Dream Makers".  In 2015, her comedic performance in "Yes We Can! " earned Lim her very first Best Actress Award at MediaCorp's annual Star Awards Ceremony, after being tipped to win by local media outlets.  Lim has an official fan club called "The Becker's Team".

Yang Zishan: Yang Zishan (born 6 November 1986) is a Chinese actress.  She is known for her breakout role in Zhao Wei's film "So Young", which won her Outstanding New Actress at the Huabiao Awards.  In 2015, she won the Best Actress award at the China Movie Channel Media Awards for her performance in "20 Once Again".  She starred in "Walking Past the Future", the only Chinese film to be nominated for the Un Certain Regard at the 2017 Cannes Film Festival, and the science fiction thriller "Battle of Memories" in 2017.

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.  The film is a remake of the South Korean movie "Miss Granny".  It was released on January 8, 2015.

Li Chen (actor): Li Chen (born 24 November 1978), also known as Jerry Li is a Chinese actor.  He is best known for being a cast member in the variety show "Keep Running".  Li is also known for his roles in television series "Beijing Love Story" (2012), "Beijing Youth" (2012) and "The Good Fellas" (2016); as well as films "Ultimate Rescue" (2008), which won him the China Movie Channel Media Awards and "Aftershock" (2010).  Li made his directorial debut in 2017 with "Sky Hunter".

Battle of Memories: Battle of Memories is a 2017 Chinese science fiction crime thriller film directed by Leste Chen and starring Huang Bo, Xu Jinglei, Duan Yihong, Yang Zishan and Ann Hsu.  It was released in China on April 28, 2017.

Critics' Choice Movie Award for Best Actress: The Critics' Choice Movie Award for Best Actress is an award given out at the annual Critics' Choice Movie Awards.  The awards are presented by the Broadcast Film Critics Association (BFCA) and was first presented in 1995.  There were no official nominees announced until 2001.  There have been two ties in this category (2008, 2009) and there are currently six nominees annually.  This is the main best actress award for leading dramatic performances.  The Critics' Choice also have other categories for lead actress; Best Actress in a Comedy and Best Actress in an Action Movie.  For supporting actress, see Critics' Choice Movie Award for Best Supporting Actress.

Supporting paragraphs: Yang Zishan 20 Once Again
Answer: Leste Chen