Question: What is the stage name of the singer who is starring in "The Underdog" alongside Park So-dam and Park Chul-min?

full_context: Document 1: Exo (band): Exo (Korean: 엑소 ; stylized as EXO) is a South Korean-Chinese boy group based in Seoul. Formed by S.M. Entertainment in 2011, the group debuted in 2012 with twelve members separated into two subgroups, Exo-K (Suho, Baekhyun, Chanyeol, D.O., Kai, and Sehun) and Exo-M (Xiumin, Lay, Chen and former members Kris, Luhan and Tao ), performing music in Korean and Mandarin respectively. Exo's first album "XOXO" (2013), which contained the breakthrough hit "Growl", was a critical and commercial success, winning both Disk Daesang at the 28th Golden Disk Awards and Album of the Year at the 15th Mnet Asian Music Awards. It sold over one million copies, making Exo the best-selling Korean artist in twelve years. Subsequent albums and EPs continued with strong sales, and Exo were ranked the most influential celebrity by "Forbes" Korea Power Celebrity for the years 2014 and 2015. They have been named "the biggest boyband in the world" by media outlets.
Document 2: D.O. (entertainer): Do Kyung-soo (born (1993--) 12, 1993 ), better known by his stage name D.O., is a South Korean singer and actor. He is best known as a member and one of the main vocalists of the South Korean-Chinese boy group EXO. Apart from his group's activities, D.O. has also starred in various television dramas and movies such as "Pure Love" (2016) and "My Annoying Brother" (2016).
Document 3: Nam Woo-hyun: Nam Woo-hyun (Hangul: 남우현 ; Hanja: 南優賢 ; born February 8, 1991), commonly known by his mononym Woohyun, is a South Korean singer and actor with the boy band Infinite. In 2016 he released a solo album.
Document 4: Jun. K: Kim Min-jun (; born January 15, 1988), better known by his stage name Jun. K, is a South Korean singer, songwriter, record producer, rapper, dancer and actor. He is the main vocalist of 2PM.
Document 5: Gong Yoo: Gong Ji-chul (; born July 10, 1979), better known by his stage name Gong Yoo (), is a South Korean actor. He is best known for his roles in television dramas "The 1st Shop of Coffee Prince" (2007) and "" (2016-2017), and the films "Silenced" (2011), "The Age of Shadows" (2016), and "Train to Busan" (2016).
Document 6: Sympathy for the Underdog: Sympathy for the Underdog, known in Japan as Bakuto-Gaijin Butai (博徒外人部隊 , "Outlaw Gambler-Foreign Legion") , is a 1971 Japanese yakuza film directed and co-written by Kinji Fukasaku and starring Koji Tsuruta and Noboru Ando. It is director Fukasaku's ("Battles Without Honor and Humanity", "Battle Royale") last film featuring Koji Tsuruta. "Complex" named it number 8 on their list of The 25 Best Yakuza Movies. Home Vision Entertainment released the movie on DVD in North America in 2005.
Document 7: Cho Kyuhyun: Cho Kyu-hyun (born February 3, 1988), better known mononymously as Kyuhyun, is a South Korean singer and musical theatre actor. He is best known as a member of South Korean boy group Super Junior, its sub-groups Super Junior-K.R.Y., Super Junior-M and a former member of the South Korean ballad group S.M. the Ballad. He is one of the first four Korean artists to appear on Chinese postage stamps.
Document 8: Suho: Kim Jun-myeon (born (1991--) 22, 1991 ), better known by his stage name Suho (meaning "guardian" in Korean), is a South Korean singer and actor. He is a member and leader of the South Korean-Chinese boy group EXO and its sub-unit EXO-K.
Document 9: L (South Korean singer): Kim Myung-soo (born March 13, 1992), better known by his stage name L, is a South Korean singer and actor. He is a member of the boy band Infinite and its sub-group Infinite F.
Document 10: Underdog (film): Underdog is a 2007 American family superhero comedy film based on the 1960s cartoon series of the same name. Directed by Frederik Du Chau and written by Joe Piscatella, Adam Rifkin, and Craig A. Williams, the film stars Jim Belushi, Peter Dinklage, John Slattery, and Patrick Warburton with the voice talents of Jason Lee, Amy Adams, and Brad Garrett. Unlike the TV series, the Underdog character is portrayed as a regular dog rather than an anthropomorphic one. Underdog, voiced by Jason Lee, was played by a lemon beagle named Leo sporting a red sweater and a blue cape. The film grossed $65.3 million worldwide.
Document 11: The Underdog (film): The Underdog (Hangul: 언더독 ; RR: "eondeodog "; lit. Underdog ) is an upcoming South Korean theatrical animated film about the story of abandoned dogs. The film is directed by Lee Chun-baek and Oh Sung-yoon and stars Do Kyung-soo, Park So-dam and Park Chul-min in the lead roles. It will be released in summer of 2017.
Document 12: Lee Hwan-kyung: Lee Hwan-kyung (born 1970) is a South Korean film director and screenwriter. Lee debuted with "He Was Cool" (2004). His next two features, "Lump Sugar" (2006) revolves around Si-eun who dreams of becoming a jockey and "Champ" (2011), which is based on a true story, depicts the relationship between a recently injured racehorse and the jockey who is gradually losing his eyesight. His fourth feature "Miracle in Cell No. 7" (2013) became the biggest hit of the year with more than 12.32 million viewers.
Document 13: Okja: Okja is a 2017 action-adventure film directed by Bong Joon-ho and co-written by Bong and Jon Ronson. The film stars an ensemble cast headed by South Korean child actress Ahn Seo-hyun, alongside Hollywood actors Tilda Swinton, Paul Dano, Steven Yeun, Lily Collins, and Jake Gyllenhaal.
Document 14: Barking Dogs Never Bite: Barking Dogs Never Bite (Korean: 플란다스의 개 , also known as "A Higher Animal" and "Dog of Flanders") is a 2000 South Korean dark comedy-drama film. The film's original Korean title is a satirical take on "A Dog of Flanders", a European pet story that is very popular in parts of East Asia. It is also the directorial debut of Bong Joon-ho, who would later go on to direct "Memories of Murder" in 2003, "The Host" in 2006, and "Snowpiercer" in 2013.
Document 15: Rock Dog: Rock Dog ( literally "Rock and Roll Tibetan Mastiff") is a 2016 computer-animated comedy film produced by Mandoo Pictures and Huayi Brothers. The film is directed by Ash Brannon, written by Brannon and Kurt Voelker, based on the Chinese graphic novel "Tibetan Rock Dog" by Zheng Jun. It features the voices of Luke Wilson, Eddie Izzard, J. K. Simmons, Lewis Black, Kenan Thompson, Mae Whitman, Jorge Garcia, Matt Dillon and Sam Elliott. The film follows a young Tibetan Mastiff who leaves his home village in the mountains to become a rock musician in the big city after a radio falls from the sky.
ground_truth: D.O.