Jo Kwon
Gain appeared on "We Got Married" with 2AM's Jo Kwon starting from September 2009. Their virtual marriage came to an end after 15 months in January 2011. She made her acting debut in MBC daily sitcom "All My Love". She was the female lead Hwang Geum-ji, alongside Jo Kwon, who played the role as her younger twin brother Hwang Ok-yeop. Her character was the love interest of Yoon Doo-joon (from BEAST) character also named "Yoon Doo-joon". However, owing to schedule conflicts, her participation in the sitcom ended in May 2011. In 2013, she became one of the three main female characters for "The Huntresses", along with Ha Ji-won and Kang Ye-won. She also participated in JTBC's "Going to School" in 2015, along with other idols such as Taemin of Shinee and Seulgi of Red Velvet.