Sulli was born on 29 March 1994 in the City of Yangsan, South Gyeongsang Province, Republic of Korea, but spent her childhood in Busan. Her real name is Choi Jin Ri; her given name means the truth in Korean. She is the only daughter of her family, having two older brothers and a younger brother. Her mother enrolled her in acting school at a young age.
Sulli first came to Seoul in 2004 while in the fourth grade, and in 2005 and began acting professionally as Princess Sunhwa in the SBS drama The Ballad of Seodong and, some time later, had a cameo role in yet another SBS drama, Love Needs a Miracle. She later developed a desire to become a singer, a dream she followed by attending an SM audition, during which she sang the S.E.S song titled Chingu (Friend). After the audition she was officially cast as an SM trainee and in 2005, while in fifth grade, moved into a dormitory with Taeyeon and Tiffany of Girls' Generation. Here she continued to do so up until the debut of Girls' Generation, in 2007.
Sulli attended Jungbu Elementary School (중부초등학교) and then attended Chungdam Middle School (청담중학교). She graduated from School of Performing Arts Seoul alongside with miss A's Suzy and her classmate former A Pink member Yookyung, while focusing on acting. Sulli is currently featured on her school's website homepage.
Sulli accepted into S.M. Entertainment through an SM audition casting system, from there she became an SM’s trainee before become f(x) member and lived in Seoul alone without her parents. On September 1, 2009 Sulli and her group f(x) debuted with their single 'La Cha Ta'.
From the Year of 2012 and 2013 Sulli is then highly acknowledge for her vocals of performing high notes which is recognized in f(x) albums Electric Shock and Pink Tape such as from their single "Airplane".
Sulli began acting professionally at the age of 11, when she was back selected to play young Princess Sun-hwa in the SBS television drama, The Ballad of Seo-dong. A few months later, she made a cameo appearance in Love Needs a Miracle, another SBS television drama. In 2006, she made a small supporting appearance as the childhood crush of TVXQ/JYJ's Micky Yoochun in the theatrical drama Vacation. Sulli later landed a minor role in Punch Lady and The Flower Girl is Here (2007) and also BABO (2008).
On August 13, 2013, SM Entertainment announced on August 13 that the singer will star alongside Son Ye Jin and Kim Nam Gil in the Korean film Pirates set to be released in the first half of 2014. Sulli's will be playing Heuk Myo (a supporting character) who is the mood maker and has a lively personality. Lee Suk Hoon, who directed the 2012 movie 'Dancing Queen,' will direct Pirates which has a 10 billion won production budget and has been likened as a Korean version of Pirates of the Caribbean (this does not mean that the film will be like Pirates of the Caribbean but based on the theme). Set in the Joseon era, the storyline tells of a group of female pirates and male bandits in search of treasure that has been swallowed by a whale.
In late 2013 rumors have surfaced online of Sulli possibly taking on the role of the female lead of the Korean movie Fashion King starring alongside Joo Won. By of late December 2013, The movie's production company announced on December 27, "Joo Won, f(x)'s Sulli, and Kim Sung Oh have been confirmed to star in the film 'Fashion King'." A rep from Joo Won's agency Sim Entertainment stated, "After being in talks for 'Fashion King', it is true that Joo Won's casting was recently confirmed."'Fashion King' (not to be confused with the past drama or the survival variety show of the same title) is based on a popular webtoon and portrays the story of a male student Woo Ki-Myung (Joo Won) who becomes interested in fashion and tries to become the most handsome and best dressed man around. The reason for his decision is due to his wish to become a cool enough guy to catch the attention of the ulzzang girl in his class portrayed by Park Se-young.  Sulli will be taking on the role of Kwak Eun-Jin (Sulli) likes Woo Ki-Myung. She attempts to change her style to catch his attention. 
Sulli is widely known in Korea as "Giant Baby" because of her baby face and being the tallest member in f(x), having her the height of 170 cm. She is the member that debuted first as a child actress in the drama The Ballad of Seo-dong as Young Princess Sun-Hwa and is highly recognized for her acting abilities especially for her role in the Korean film Punch Lady as Gwak Chun Sim. She is also known as the group's maknae (alongside Krystal),vocalist and sub-rapper. She is also praised as one of the unique beauties among Korean idols. In this singer IU has written and composed the song "Peach" about Sulli. Official statements and articles online have been released which state that among SM artists Sulli is considered in the Top 6 among SM beauties alongside Girl's GenerationYoona.