Question: While Bang Eun-jin directed Perfect Number, which film was her directorial debut?

Context paragraphs:
Byron Q: Byron Q (born Byron Chan and also known as Byron Qiao) is an American filmmaker, director and writer.  His film production company is known as "Beyond Cinema Productions."  His debut feature film, "Bang Bang" (2011), which won a Special Jury Award for Best First Feature, Narrative, at the 2011 Los Angeles Asian Pacific Film Festival.  The film also starred Thai Ngo, David Huynh, Jessika Van, Walter Wong, Yen Ly, Vanna Fut and Peter Chanhthavongsak.  He has also Directed and Written a Web Series entitled "Hollywood Aliens," starring David Huynh, who also appeared in "Bang Bang."  He has directed and written a documentary about "Bang Bang" cast member Vanna Fut entitled "Raskal Love".  He has recently finished shooting a feature film set in Las Vegas entitled "Las Vegas Story".

Way Back Home (2013 film): Way Back Home () is a 2013 South Korean drama film starring Jeon Do-yeon and Go Soo, and directed by Bang Eun-jin.  It is based on the true story of an ordinary Korean housewife who was imprisoned in Martinique for two years after being wrongfully accused of drug smuggling at a Paris airport.

Elizabeth Banks: Elizabeth Irene Banks (née Mitchell; February 10, 1974) is an American actress, director, and producer.  Banks made her film debut in the low-budget independent film "Surrender Dorothy" (1998), and is known for her roles in such films as "Wet Hot American Summer" (2001), Sam Raimi's "Spider-Man" trilogy (2002–2007), "Seabiscuit" (2003), "The 40-Year-Old Virgin" (2005), "Zack and Miri Make a Porno" (2008), "Role Models" (2008), "The Next Three Days" (2010), "Pitch Perfect" (2012), "The Lego Movie" (2014), and "The Hunger Games" film series (2012–2015).  In 2014, she portrayed Melinda Ledbetter, the girlfriend and later wife of the Beach Boys co-founder Brian Wilson, in the biographical drama "Love & Mercy" and made her directorial debut with "Pitch Perfect 2", whose $69M opening weekend gross set a record for a first-time director.

Bang Eun-jin: Bang Eun-jin (born August 5, 1965) is a South Korean actress and film director.  She is best known for starring in Park Chul-soo's "301, 302" and Kim Ki-duk's "Address Unknown".  Bang made her feature directorial debut with "Princess Aurora" in 2005, and has since directed "Perfect Number" (2012), and "Way Back Home" (2013).

You Can't Kill Stephen King: You Can't Kill Stephen King is a 2012 American comedy horror film that was directed by Monroe Mann, Ronnie Khalil, and Jorge Valdés-Iga, and is the directorial debut of Khalil and the feature film directorial debut of Mann.  The film had its world premiere on 14 April 2012 at the Lewiston Auburn Film Festival and was later released to DVD on 9 December 2014 through Big Screen Entertainment Group.  The film follows a group of friends that decide to visit the area horror author Stephen King lives, but find themselves threatened with their own potential deaths.

Musafir (1957 film): Musafir is a 1957 Hindi movie, written by Ritwik Ghatak and Hrishikesh Mukherjee, and directed by the latter in a directorial debut.  The film is about a house and the lives of three families who live in it, so in essence it is three stories linked by the house.  The movie is Hrishikesh's directorial debut.  The film stars Dilip Kumar, Kishore Kumar, Keshto Mukherjee, Suchitra Sen and Nirupa Roy.  The music is by Salil Chowdhury.

Sajid Yahiya: Sajid Yahiya is an Indian film actor and director known for his work in Malayalam cinema.  He made his acting debut in "Collector" directed by Anil C Menon.  His second movie," Friday" was the directorial debut of Lijin Jose.  He was then approached by Roopesh Peethambaran to play a role in Theevram.  After this, he acted on "Kaashh", "Arikil Oraal", and "Amen".  Other notable films Include "Pakida" and" Bangalore Days".  He made his directorial debut through Malayalam action-comedy film IDI - Inspector Dawood Ibrahim.

Princess Aurora (film): Princess Aurora is a 2005 South Korean film about a mother over grieving the death of her child, who goes on a murderous revenge spree.  It was the directorial and writing debut of actress-director Bang Eun-jin.

Perfect Number (film): Perfect Number (; lit.  Suspect X) is a 2012 South Korean mystery-drama film directed by Bang Eun-jin.  Adapted from Keigo Higashino's novel "The Devotion of Suspect X", it centers around a mild-mannered mathematics teacher (Ryoo Seung-bum) who plans the perfect alibi for the woman he secretly loves (Lee Yo-won) when she unexpectedly murders her abusive ex-husband.  Cho Jin-woong received a Best Supporting Actor nomination at the 49th Baeksang Arts Awards in 2013.

Bang Gang (A Modern Love Story): Bang Gang (A Modern Love Story) (French: Bang Gang (une histoire d'amour moderne) ) is a French drama film directed by Eva Husson.  It was shown in the Platform section of the 2015 Toronto International Film Festival.  It is Husson's directorial debut.

Supporting paragraphs: Bang Eun-jin Perfect Number (film)
Answer: Princess Aurora"