Choi Jin-ri (March 29, 1994 – October 13 or 14, 2019), better known by her stage name Sulli (), was a South Korean actress, singer, and model. Sulli first made her debut as a child actress, appearing as a supporting cast member on the SBS historical drama Ballad of Seodong (2005). Following this, she earned a number of guest roles, appearing in the television series Love Needs a Miracle (2005) and Drama City (2007), and the film Vacation (2006). She then subsequently appeared in the independent films Punch Lady (2007) and BA:BO (2008), the former being her first time cast in a substantial dramatic role.

After signing a record deal with SM Entertainment, Sulli rose to prominence as a member of the girl group f(x) formed in 2009. The group achieved both critical and commercial success, with four Korean number-one singles and international recognition after becoming the first K-pop act to perform at SXSW. Concurrently with her music career, Sulli returned to acting by starring in the SBS romantic comedy series, To the Beautiful You (2012), a Korean adaptation of the shōjo manga Hana-Kimi where her performance was positively received and earned her two SBS Drama Awards and a nomination at the 49th Paeksang Arts Awards.

Sulli's film career progressed with her starring in the fantasy swashbuckler The Pirates (2014) and the coming-of-age drama Fashion King (2014). During the press tour for The Pirates, Sulli took a hiatus from the entertainment industry due to health issues and following a year long absence from promoting with f(x), she left the group in August 2015. Between 2015 and 2017, she embarked on a number of modelling campaigns before becoming a global brand ambassador for Estée Lauder. Sulli garnered attention for her role in the experimental neo-noir thriller Real (2017). She later returned to the music industry in 2018, making a guest appearance on Dean's single "Dayfly" and releasing her debut solo single "Goblin" in June 2019, which was her last musical project prior to her death.Sulli was recognized as a prominent figure in Korean popular culture for her outspoken persona, becoming the most Googled person in South Korea in 2017, ahead of then-President of South Korea Moon Jae-in, and former President of South Korea Park Geun-hye, who was impeached that year.