Question: The actor that played a university professor in "March", appeared in what courtroom thriller film directed by Sohn Young-sung?

Context paragraphs:
Eric Muenter: Eric Muenter (1871–1915), also known as Erich Münter, Erich Muenter, Erich Holt or Frank Holt, was a German-American activist and would-be assassin whose secret attacks on America on behalf of Germany foreshadowed future terrorist attacks.  Although employed as a German professor at elite American universities, he was actually a spy and a "fanatic in the clandestine service of the Imperial German government."  As a professor at Harvard University, he poisoned and killed his wife.  He appeared again as Cornell University professor Frank Holt who contacted the German spy network which undertook to sabotage US aid to the war in Europe against Germany.  In 1915, he planted a bomb which exploded in the US Capitol, shot Jack Morgan, son of financier J.P. Morgan in his home, and predicted the bombing of a steamship bound for England before committing suicide under custody of police.  His activities along with those of other Germans were played up by the press as "Hun barbarity" anti-German feelings rose in the years as America eventually entered the war with Germany.

One or the Other of Us: One or the Other of Us (German: "Einer von uns beiden" ) is a 1974 West German film directed by Wolfgang Petersen.  It was Petersen's first theatrical feature film, and was based on the novel of the same name by Horst Bosetzky, published anonymously under his pseudonym -ky.  The film is a psychological thriller and focuses on the intense conflict between a university professor and a blackmailer.  The film features Klaus Schwarzkopf and Jürgen Prochnow as the two main characters and won two Bundesfilmpreise.

The Client (2011 film): The Client () is a 2011 South Korean courtroom thriller film director by Sohn Young-sung.

Jagged Edge (film): Jagged Edge is a 1985 American film starring Glenn Close, Jeff Bridges, and Peter Coyote.  It is a courtroom thriller, written by Joe Eszterhas and directed by Richard Marquand.  Robert Loggia was nominated for the Academy Award for Best Supporting Actor for his role.

Sung Dong-il: Sung Dong-il (born April 27, 1967) is a South Korean actor.  Sung made his acting debut in theater in 1987, then was recruited at the 1991 SBS open talent auditions.  He rose to fame as the comic, Jeolla dialect-speaking character "Red Socks" in the television drama "Eun-shil", though he later tried to fight typecasting by playing the son of a chaebol tycoon in "Love In 3 Colors" and a university professor in "March".  Following years of supporting roles in TV, Sung's film career was jumpstarted by hit romantic comedy "200 Pounds Beauty" in 2006.  Subsequently, he became one of Korean cinema's most reliable supporting actors, displaying his comic skills and easy charm in films such as "Take Off", "Foxy Festival", "Children...", "The Suicide Forecast", and "The Client".  He also had major roles in "The Suck Up Project: Mr. XXX-Kisser", 3D blockbuster "Mr. Go", and mystery-comedy "The Accidental Detective".  On the small screen, Sung garnered praise as a villain in "The Slave Hunters", and a gruff but caring father in "Reply 1997" and its spin-offs "Reply 1994" and "Reply 1988".

George Serdula: George Serdula (January 17, 1920 – October 26, 2002) was an American football player, coach, and university professor.  He served as the head football coach at Ball State Teachers College—now Ball State University—from 1953 to 1955, compiling a record of 14–9–1.  Serdula played college football at Muskingum College, from which he graduated in 1942.  He served in the United States Army Air Corps during World War II as a flight engineer, and held the rank of first lieutenant.  Serdula resigned at football coach at Ball State in March 1956 to complete a doctoral degree at Indiana University.  He was later a professor of health sciences at St. Cloud State University.  Serdula was inducted into the died on Muskingum Hall of Fame in 1993.  He died on October 26, 2002 in St. Cloud, Minnesota.

Roberto Ampuero: Roberto Ampuero (Valparaíso, Chile, 1953) is a Chilean author, columnist, and a university professor.  His first novel "¿Quién mató a Kristián Kustermann?"  was published in 1993 and in it he introduced his private eye, Cayetano Brulé, winning the Revista del Libro prize of "El Mercurio".  Since then the detective has appeared in five novels.  In addition he has published an autobiographical novel about his years in Cuba titled "Nuestros Años Verde Olivo" (1999) and the novels "Los Amantes de Estocolmo" (Book of the Year in Chile, 2003 and the bestseller of the year in Chile)) and "Pasiones Griegas" (chosen as the Best Spanish Novel in China, 2006).  His novels have been published in Latin America and Spain, and have been translated into German, French, Italian, Chinese, Swedish, Portuguese, Greek, Croatian, and English.  In Chile his works have sold more than 40 editions.  Ampuero now resides in Iowa where he is a professor at the University of Iowa in the Department of Spanish and Portuguese.  He was a columnist of "La Tercera" and the "New York Times" Syndicate and since March 2009 has been working as a columnist for "El Mercurio".  Between 2013 and 2014 he was Minister of Culture in the Conservative government of Sebastián Piñera.

Arlington Road: Arlington Road is a 1999 American drama mystery thriller film which tells the story of a widowed George Washington University professor who suspects his new neighbors are involved in terrorism and becomes obsessed with foiling their terrorist plot.  The film was heavily inspired by the paranoid culture of the 1990s concerning the right-wing militia movement, Ruby Ridge, the Waco siege and Oklahoma City Bombing.  The film stars Jeff Bridges, Tim Robbins, Joan Cusack, and Hope Davis and is directed by Mark Pellington.  Ehren Kruger wrote the script, which won the Academy of Motion Picture Arts and Sciences' (AMPAS) Nicholl Fellowship in 1996.  The film was to have been originally released by PolyGram Filmed Entertainment, but was sold to Sony Pictures Entertainment before it opened.  The eventual release was the second title for Screen Gems while PolyGram (now part of Universal Studios) handled foreign rights.  Tomandandy composed additional music in the film.

Guilty as Sin: Guilty as Sin is a 1993 courtroom drama thriller film written by Larry Cohen, directed by Sidney Lumet and produced by Martin Ransohoff.  It stars Rebecca De Mornay and Don Johnson, and was produced by Hollywood Pictures.

Pink (2016 film): Pink is a 2016 Indian courtroom drama social thriller film directed by Aniruddha Roy Chowdhury, written by Ritesh Shah, and produced by Rashmi Sharma Telefilms (Pawan Kumar and Rashmi Sharma), Sheel Kumar and Shoojit Sircar.

Supporting paragraphs: Sung Dong-il The Client (2011 film)
Answer: The Client