I found this on quora and I think this is legit I am only posting parts I think are important. This person said they were an employee at 5m who left due to disagreements with the company they worked for N*t, XO and RV this post is from October 2020
SM pays a ton to Dispatch, likely more than other companies but this is unknown.
Idols there may date or have fling but they keep it down low as much as possible. Very good hiding dating status with non groupmates
For shipping, idols are made to enforce ship, especially gay (male) ones. They cannot fight any of this because they could have consequence like losing job, money, outing, ect. SM goes overboard and likes to exploit friendships. Idols and company very much aware of shipping, as you can tell, and some friendships are nearly severed.
SM picks favorite in every group, it is easy to see. Sometimes favorite changes and other idols purposefully targeted and pushed aside because their talent is seen as a “threat” to favorite/s of the group.
NCT 127 unit, Shinee, and Red Velvet specifically show visible and serious signs of depression, anxiety, panic attacks, and eating disorder behind the scenes, and fake happy on camera(smile a lot, laugh, joke, talk positively about themself and other members, ect). Has been an ongoing problem that SM poorly adresses. Members know and try to help. Both male and female have disordered eating.
Overworking and ignoring injuries is common. And made to feel guilt if they take health seriously. This happens in all groups.
RV:
Red Velvet not being treated well, got worse after Aespa formed. Talks of disbandment. The girls are hurt, but not suprised, this is pattern with SM’s girlgroups. SM doesn’t care about girlgroups in general, doesn’t think they’re as important as boygroup or worth time. Fans really need to prove that this is not the case if they want change.
NCT:
Yuta, Taeyong, Ten, Jungwoo, Yangyang, and Jaemin are in lgbt community. This is open secret, and it is likely used against them in one way or another. (think blackmail)
Some members of NCT and EXO try to learn about social issues and work to become more accepting. This may be case for other groups, too
NCT members are made to act how they act around Winwin. Of course they love him, but not to the extent you see on camera. Winwin is very uncomfortable with it and always was, and others are too.
Mark scared to talk to fans after live incident. Seeing fans upset with him hurts him to the core.
most of this stuff does not surprise me except for the the gay fanservice part I didn't know that those who refuse to do gay fanservice may even lose their job or not get paid by the company I feel bad for those who are forced to do it all the time even if it makes them uncomfortable. Also I know about ten and Yuta's gay rumors but didn't know T@eyong, jungwoo, j@emin, yangyang are part of LGBT community as well