During that incident that was reported to be a suicide attempt, Goo Hara had to be hospitalised in Seoul.
The body of Koo Hara, 28, was discovered at her home in southern Seoul, Yonhap said. She described their friendship as being "like sisters"; in a livestream, she vowed, "I will live twice more diligently now that you are gone", adding, "Dear fans, I will be fine".
K-pop star Sulli had also spoken out against cyber bullying before her death. She also mentioned about the pressures of being a celebrity and the difficulties that came with it.
Goo was abused by an ex-boyfriend previous year who - after they split - blackmailed her over their sex videos. "I'm very sorry", he wrote on Instagram.
The ex, hairdresser Choi Jong-bum, threatened "to end her entertainment career" by leaking the footage, and a CCTV clip of the couple showed the singer kneeling before him apparently begging him not to.
During a press conference, the Gangnam police station revealed that it is estimated that Hara died after midnight and because no evidence of violence was found, an autopsy was not carried out.
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There has been a succession of suicides among K-Pop stars, with many complaining of experiencing depression and enormous pressure in an industry that is driven by fandoms, where a certain pattern of behavior is expected.
It's reported the pop singer then suspended her music profession as a result of abuse she had obtained in conservative South Korea.
Goo Hara had posted the following "goodnight" message Saturday night to her 1.5 million followers on Instagram, fans have since responded with messages of sympathy for her.
Korean idol stars like Sulli and Hara got into the industry at a young age. Many people are dissuaded to go to a psychiatrist for a mental check-up.
Sulli's dying echoes that of fellow Ok-pop star Jonghyun, who took his life in 2017 after battling with melancholy. I can not beat depression anymore.
Such challenges are widespread amongst celebrities all over the world, he informed AFP, however are amplified within the hyper-wired South, which has a number of the world's quickest web speeds and highest smartphone utilization, and a society the place strain to evolve is excessive.