Warning: There are mentions of suicide, which may not be suitable for all audiences.

Well-known health YouTuber Kim Woong Seo, 38, with 120,000 subscribers, was initially reported by his family to have died by accident.

A few hours later, however, his YouTube channel briefly posted something that seemed like a suicide note, challenging a lot of speculation surrounding the conditions of his death.

As per Maeil Business Newspaper, the post — allegedly pre-set up by Kim before his death — implied he'd taken an "unreasonable decision" as he'd been facing "various difficulties."

In the note, Kim wrote, "I probably am not a person in this world at the time this post is released. My feelings are infinitely heavy as I am writing this article now."

He questioned, "Is there anyone in the world who wants to die? There are so many unfair things in life."

Kim reportedly said that he was a victim of fraud, too, and held a vendetta against an unknown person he labeled as a "sex offender scammer."

"The embezzlement you committed will be carried out by the corporation, and the fraud will be left first, so you will avoid legal punishment, but there will be many other things waiting."

Reflecting on his life, Kim noted, "While standing, I feel all kinds of joy, anger, sorrow and pleasure. I will smile and shake at the end because it was a pretty good life."

He concluded with a poignant farewell: "Funerals are not necessary and there is no one to leave behind. I hope you all have a happy and daily life. Goodbye."

The post reportedly was deleted almost immediately after it was published.

On social media, Kim's family said he was "full of energy" and had made a "long journey to the sky" following his death in an accident. They asked people to remember him with kindness.

Kim's death has made headlines not only from the public and the former's fans but also regarding topics like mental health and online pressures.