Question: How many episodes did the television series, starring Lee Ji-eun, air?
Context: You're the Best!  () is a 2013 South Korean television series starring IU, Jo Jung-suk, Go Doo-shim, Lee Mi-sook, Yoo In-na, Son Tae-young, Go Joo-won, and Jung Woo.  Fifty episodes aired on KBS2 from March 9 to August 25, 2013, at 7:55 pm on Saturdays and Sundays.  The drama is about a family, devastated after the sudden death of the father, that learns the true meaning of love and happiness.  The show incorporates themes of self-discovery and reconciliation. Lee Ji-eun (Korean: 이지은 ; born May 16, 1993), better known by her stage name IU (Korean: 아이유 ), is a South Korean singer, songwriter and actress.  While still in middle school, IU auditioned for various talent agencies with ambitions of becoming a singer.  She signed with LOEN Entertainment in 2007 as a trainee and began her music career at the age of 15 with her debut album, "Lost and Found".  Her follow-up albums, "Growing Up" and "IU...IM", brought her mainstream success, but it was through "Good Day" (Korean: 좋은 날 ), the lead single from her 2010 album "Real", that she achieved national stardom.  "Good Day" spent five consecutive weeks at the top position of South Korea's Gaon Digital Chart and holds the record for spending the most number of weeks at No. 1 along with Psy's "Gangnam Style". Stories of Jesus is an Australian television series which aired from 1957 to 1958.  It was shown on ABC in Melbourne and Sydney, the only two cities in Australia which had television at the time.  As the title suggests, it was a religious series.  It aired in a 10-minute time-slot.  It is not known how many episodes were produced.  Remarkably, despite the mass wiping of ABC archival material in the 1970s, the National Film and Sound Archive holds four episodes, though one of these prints is missing the soundtrack. M Squad is an American crime drama television series that ran from 1957 to 1960 on NBC.  It was produced by Lee Marvin's Latimer Productions and Revue Studios.  Its main sponsor was the Pall Mall cigarette brand; Lee Marvin, the program's star, appeared in its commercials during many episodes.  Alternate sponsors were General Electric (GE), Hazel Bishop and Bulova watches. Steven DePaul is an American television director and producer.  He has directed multiple episodes of Shades of Blue, NCIS-LA, CSI-NY, GRIMM, The Unit, Bones, as well as many episodes of one-hour dramatic television (updated list IMDB).  He was a longstanding producer and director on "NYPD Blue".  In his capacity as producer of "NYPD Blue" he won the Emmy Award for Outstanding Drama Series in 1995 and the Golden Globe Award for Best Television Series – Drama in 1993.  He was also nominated for this award for his work on "NYPD Blue" on five other occasions (in 1994, 1996, 1997, 1998 and 1999).  He won a George F. Peabody for "Raging Bulls" (Season 6, episode 8), an episode he directed for NYPD Blue. Greg Mullavey (born Gregory Mulleavy, September 10, 1939, Buffalo, New York) is an American film and television actor, best known for his role as Tom Hartman on the television series "Mary Hartman, Mary Hartman" and Carly and Spencer Shay's grandfather in many episodes of the hit Nickelodeon television series, "iCarly". Three Brothers () is a 2009 South Korean television series starring Ahn Nae-sang, Oh Dae-gyu, Lee Joon-hyuk, Park In-hwan, Do Ji-won, Kim Hee-jung and Oh Ji-eun.  It aired on KBS2 from October 17, 2009 to June 13, 2010 on Saturdays and Sundays at 19:55 for 70 episodes. Ex-Girlfriend Club () is a 2015 South Korean television series starring Byun Yo-han, Song Ji-hyo, Lee Yoon-ji, Jang Ji-eun and Ryu Hwayoung.  It aired on tvN from May 8 to June 13, 2015 on Fridays and Saturdays at 20:30 for 12 episodes. My Girl () is a 2005 South Korean television series starring Lee Da-hae, Lee Dong-wook, Lee Joon-gi and Park Si-yeon.  It aired on SBS from December 14, 2005 to February 2, 2006 on Wednesdays and Thursdays at 21:55 for 16 episodes.  The romantic comedy series was a hit during its run—it placed number one in its timeslot and reached a peak viewership rating of 24.9%.  It also catapulted actors Lee Da-hae, Lee Dong-wook and Lee Joon-gi into Korean Wave stardom. Sherlock Holmes was a detective television series aired in syndication in the fall of 1954, based on the Sherlock Holmes stories of Arthur Conan Doyle.  The 39 half-hour mostly original stories were produced by Sheldon Reynolds and filmed in France by Guild Films, starring Ronald Howard (son of Leslie Howard) as Holmes and Howard Marion Crawford as Watson.  Archie Duncan appeared in many episodes as Inspector Lestrade (and in a few as other characters).  Richard Larke, billed as Kenneth Richards, played Sgt. Wilkins in about fifteen episodes.  The series' associate producer, Nicole Milinaire, was one of the first women to attain a senior production role in a television series.
Answer: Fifty