Question: Who directed the South Korean film for which Choo Ja-hyun was best known? 

Context paragraphs:
Mapado: Mapado () is a 2005 South Korean film directed by Choo Chang-min.

Portrait of a Beauty: Portrait of a Beauty () is a 2008 South Korean film directed by Jeon Yun-su.  Adapted from the bestselling novel "Painter of the Wind" () by Lee Jung-myung, the film portrays Joseon-era painter Shin Yun-bok (better known by his pen name, Hyewon) as being a woman disguised as a man.

301, 302: 301, 302 or "301/302" is a 1995 South Korean film directed by Park Chul-soo.  It tells the story of two South Korean women, neighbors in the same apartment building, who take very different approaches to the difficulties of modern life; one indulges in food, sex, and spending while the other lives in self-imposed austerity.  The film was selected as the South Korean entry for the Best Foreign Language Film at the 68th Academy Awards, but was not accepted as a nominee.

Seopyeonje: Seopyeonje () is a 1993 South Korean musical drama film directed by Im Kwon-taek.  Its story tells of a family of traditional Korean pansori singers trying to make a living in the modern world.  The film was originally expected to only draw limited interest, and was released on only one screen in Seoul.  At the height of its popularity, it was shown on only three screens at once in the entire city of over 10 million.  Nevertheless, it ended up breaking box-office records and became the first Korean film to draw over a million viewers in Seoul alone.  When it was released, "Sopyonje"'s success also increased interest in pansori among modern audiences.  The film was acclaimed critically, both in South Korea and abroad, getting screened in Cannes Film Festival and winning six Grand Bell Awards and six Korean Film Critics' Awards.

Tell Me Something: Tell Me Something () is a 1999 South Korean Thriller-Horror-Crime film directed by Chang Yoon-hyun.  It was an early South Korean film to find success abroad as part of the Korean Wave, and was selected to appear in the 2001 New York Korean Film Festival.

Green Fish: Green Fish () is a 1997 South Korean film.  It was the first feature-length film directed by Lee Chang-dong, who also co-wrote the screenplay.  Lee had previously been known as a novelist and high school teacher.  The film stars Han Suk-kyu in one of his first major film roles.  It was the eighth highest-attended South Korean film of 1997.

Late Blossom: Late Blossom (; lit.  "I Love You") is a 2011 South Korean film written and directed by Choo Chang-min about the love story of two elderly couples.

Choo Ja-hyun: Choo Ja-hyun (born Choo Eun-joo on January 20, 1979) is a South Korean actress.  Best known in Korea for the films "Bloody Tie" (2006) and "Portrait of a Beauty" (2008), Choo has mostly worked in China since 2007, notably in television drama "The Temptation to Go Home" (2011).

Choo Chang-min: Choo Chang-min (born 1966) is a South Korean film director and screenwriter.  His 2012 period film "Masquerade" became one of the top-grossing Korean films of all time.

No Regret (film): No Regret () is a 2006 South Korean film and the feature film directorial debut of Leesong Hee-il, based on his earlier short "Good Romance".  "No Regret" is also regarded as "the first 'real' Korean gay feature", (although earlier South Korean films, such as "Road Movie", released in 2002, have dealt with gay relationships), and is also the first South Korean feature to be directed by an openly gay Korean filmmaker.

Supporting paragraphs: Choo Ja-hyun Portrait of a Beauty
Answer: Jeon Yun-su