I don't think it is about sexuality. Most people had already assumed he was gay and always responded positively to gay issues. so I don't think that was the reason. He knew about Jongkey. I suspect money was involved because he had the sudden rush to release his book. But I don't know why because his Royalties were in the $2.7M range.
So maybe the person was asking for more than he and his family had. I think it is a person in the music industry who had personal knowledge of some of his off work activities and knowing how tough SHAWOLS treated him when he dated that actress, he probably didn't want to go through that trauma. Also considering Onew was already going through his sexual scandal. He saw no hope for the future.
So maybe it was a very personal video which involved sexual activities and he took that as a bad thing. On his death, the person in the industry may have manipulated him to accept the death, pay up more money than they knew he had, or he would expose him. So technically, he was led to the slaughter. Accept the sacrifice or become the shame of society.
The reason I say this is because of this VCR and the jacket with the suicide note. The industry knew of these things ,but they didn't respond. So maybe that was his way of communicating that he had accepted the fate. And he wrote all his goodbye songs and even with his members and just let it go. They all knew.
Also the narrative behind his death was strange
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First it wasn't an apartment. It was a hotel room according to the TV reports which also showed the location so YONHAP purposely misled everyone unless hotel rooms can also be called apartment in Korea. What gets me is that he didn't text his mom. He texted his sister who didn't know where he was and didn't even show up at the apartment? wouldn't you be frantically running around tying to locate your brother? Also Wikipedia says he had rented this hotel before. This death was prepared by everyone and the members were all in on it.
Anyway this is all in the past.