You Are the Best!, known in South Korea as The Best Lee Soon-shin, is a 2013 South Korean television series starring Lee Ji-eun, Jo Jung-suk, Go Doo-shim and Lee Mi-sook. It aired on KBS2 from March 9 to August 25, 2013, at 19:55 (KST) on Saturdays and Sundays for 50 episodes. 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, also known by her stage name IU (아이유), is a South Korean singer-songwriter and actress. She signed with LOEN Entertainment in 2007 as a trainee and debuted as a singer at the age of fifteen with Lost and Found (2008), her first extended play (EP). Although her follow-up albums, Growing Up and IU...IM, brought mainstream success, it was only after the release of "Good Day", the lead single from her 2010 album Real, that she achieved national stardom. "Good Day" went on to spend five consecutive weeks at the top of South Korea's Gaon Digital Chart, and in 2019, it was ranked number one on Billboard's "100 Greatest K-Pop Songs of the 2010s" list.