Question: Jeon Woo-chi, is a 2012 South Korean fantasy period television series, starring which South Korean actor, singer, television personality radio DJ and director, and is best known for his lead roles in the box-office hit comedies "My Sassy Girl" (2001)?
Context: Kim Yu-jin (born April 9, 1988), better known by her stage name Uee (sometimes romanized as U-ie ), is a South Korean singer and actress.  She is best known for being a former member of South Korean girl group After School from 2009 to 2017, and has acted in various television dramas including "Queen Seondeok" (2009), "Ojakgyo Family" (2011), "Jeon Woo-chi" (2012), "Golden Rainbow" (2013), "High Society" (2015) and "Marriage Contract" (2016).  On May 31, 2017, Uee graduated and left After School and its agency, Pledis Entertainment and now under Yuleum Entertainment. Jeon Woo-chi () is a 2012 South Korean fantasy period television series, starring Cha Tae-hyun as the titular Taoist wizard who becomes an unlikely hero to the people of Joseon.  It is based on the same folktale as the , but has a different story.  Also starring Uee, Lee Hee-joon, Baek Jin-hee, Kim Kap-soo and Sung Dong-il, it aired on Korean Broadcasting System from November 21, 2012 to February 7, 2013 on Wednesdays and Thursdays at 22:00 for 24 episodes. Jeon Woo-chi (; also known as Woochi, Jeon Woo-chi: The Taoist Wizard or Woochi: The Demon Slayer) is a 2009 South Korean fantasy action film written and directed by Choi Dong-hoon who departs from his popular heist films "" and "The Big Swindle" for this big-budget, special effects-filled action romp that was equally popular with the Korean audience, earning over six million admissions over the 2009 Christmas period.  Based on a Korean folktale, it stars Kang Dong-won in the title role.  The film became the 3rd best selling film of 2009 in Korea, with 6,100,532 tickets sold nationwide. Jae Hee (born Lee Hyun-kyun on May 25, 1980) is a South Korean actor.  He is best known for his leading roles in the 2004 arthouse film "3-Iron" and the 2005 television series "Sassy Girl Chun-hyang". My Sassy Girl 2 (Chinese: 我的野蛮女友2) is a 2010 Chinese romantic comedy film directed by Joe Ma and starring Lynn Hung, Leon Jay Williams, He Jiong, Abby Feng and Bosco Wong.  The film is an unofficial sequel of the 2001 South Korean film "My Sassy Girl".  It was released on November 5, 2010. My Sassy Girl is a 2008 American remake of the 2001 South Korean romantic-comedy "My Sassy Girl".  It stars Elisha Cuthbert and Jesse Bradford and was directed by Yann Samuell.  Both films are based on a true story told in a series of blog posts written by Kim Ho-sik, who later adapted them into a fictional novel.  The film is set in New York City's Central Park and Upper East Side.  Samuell, describes the film as "a fable about destiny, " while Bradford described it as "a romantic comedy about how they pull each other to a more healthy place by virtue of their relationship." Cha Tae-hyun (born March 25, 1976) is a South Korean actor, singer, television personality radio DJ and director.  He is best known for his lead roles in the box-office hit comedies "My Sassy Girl" (2001), "Scandal Makers" (2008) and "Hello Ghost" (2010) as well as the television series "Jeon Woo-chi" (2012) and "The Producers" (2015).  He made his directorial debut with the variety-drama "Hit the Top" (2017), in which he also stars. My Sassy Girl (Hangul: 엽기적인 그녀 ; RR: "Yeopgijeogin Geunyeo " ) is a 2017 South Korean television drama starring Joo Won, Oh Yeon-seo, Lee Jung-shin and Kim Yoon-hye, based on the 2001 South Korean movie "My Sassy Girl" by Kwak Jae-yong, but during Joseon period.  It aired on SBS from May 29 to July 18, 2017 on Mondays and Tuesdays at 22:00 (KST) time slot for 32 episodes. Jun Ji-hyun (born Wang Ji-hyun on 30 October 1981), also known as Gianna Jun, is a South Korean actress.  She rose to fame for her role as The Girl in the romantic comedy "My Sassy Girl" (2001), one of the highest-grossing Korean comedies of all time.  Other notable films include "Il Mare" (2000), "Windstruck" (2004), "The Thieves" (2012), "The Berlin File" (2013) and "Assassination" (2015). Kim Kwang-kyu (born December 8, 1967) is a South Korean actor.  He made his acting debut in 1999 in "Dr. K", and its director fellow Busan native Kwak Kyung-taek later cast him in a small but memorable role as a physically abusive teacher in the 2001 box-office hit "Friend".  Kim continued acting in both television and film as a supporting actor, notably in "Couple or Trouble" (2006), "The Secret of Coocoo Island" (2008), "Scent of a Woman" (2011), and "I Can Hear Your Voice" (2013).  He also appears on the reality shows "I Live Alone" (since 2013) and "Three Meals a Day" (2015).
Answer: Cha Tae-hyun