An exact cause of death is still under investigation, CNN reported. Initial evidence, including a note found at the scene, indicates that Sulli died by suicide, authorities said — though they “will leave all possibilities open and investigate.”

Until then, Sulli’s talent agency, SM Entertainment, has asked fans not to jump to conclusions.

“Please refrain from spreading speculative articles or rumors in respect of the bereaved’s family who are saddened by the sudden tragedy,” they said in a statement to local press.

Earlier this month, Sulli appeared on the South Korean TV series Reply Night, where she admitted that she was struggling with depression amid online bullying and harassment.

“My life is actually empty, so I feel like I’m lying to everyone by pretending to be happy on the outside,” she confessed, according to local reports. “I asked around a lot for advice. They told me, ‘Everyone has a dark side in their lives but they live pretending that they don’t. Don’t think of it as weird.’”

She went on to say that she continues to pretend to be happy, and “simply live a two-sided life.”

If you or someone you know is considering suicide, please contact the 988 Suicide and Crisis Lifeline by dialing 988, text “988” to the Crisis Text Line at 741741 or go to 988lifeline.org.