Victoria Song, Amber Liu, Krystal Jung, Sulli and Luna from girl group F (x) arrive to KCON 2013 convention for K-Pop fans - Day 2 at the Los Angeles Memorial Sports Arena on August 25, 2013 in Los Angeles, California.
She was known for her feminist voice and outspokenness that was rare among female entertainers in deeply conservative South Korea. She went on a yearlong hiatus in 2014 after being the subject of hateful online comments and rumors. She returned to music as a solo artist, in June 2019, with her single "Goblin".
She was also visible with her romantic relationships - a rarity - and received homophobic remarks for pecking her best friend, K-pop star and actor Goo Ha-ra, on the lips at her birthday party. The following year she quit the band and focused primarily on acting.
Sulli, who maintained a sexy and outspoken image, often found herself the target of online abuse.
Sulli had nearly six million followers on Instagram and sparked controversy in conservative South Korea with her outspoken views on feminism and for refusing to wear a bra.
K-pop band BTS, which has plagued by malicious comments, took legal action against cyber bullies past year.
Her candour on mental-health issues was another anomaly in the Korean entertainment world. People hurt me, so everything fell apart.
The entertainment industry in South Korea, especially K-pop, is notorious for its pressure-cooker environment, where idols train for years before debuting, are given meagre allowances and have gruelling performance schedules.
K-Pop star Sulli has been found dead, it is being reported. Fans also pointed out that even if someone seems happy on the outside, that does not mean they aren't struggling.