I found some rumours from chinese forums (translated, of course).

"Somi will be added to Twice once she wraps up her activities with IOI. "  really hope so :3

"Chen once fought with a fellow member big time. They are still somewhat awkward with each other to this day."   I wonder who :o

"Sohye of IOI has a backer."  no

"All of GOT7 is currently single. " great news for Lucy

"BamBam goes both ways."   not surprised. he's a real hoe too

"A lot of girls has pursued Mark (GOT7), but he's turned them all down and is currently single."   I wonder why (papa tuan won't let him date ahaha)

"Irene is dating, the person is her senior at SM." ohhh

"Both Luhan and Baekhyun have been pursued by male idols that debuted in 2013."   /forever laughing

"Joy and Sungjae are completely false. He likes guys"  I can't believe I'm saying this, but they look cute together.... snif

"VIXX's leader (N) is dating with a idol from a nugu girl group"   oh please XD

"Kris has a complicated personal life and he frequently contacts with the girls online (not sure if it means stars). He is just playing with Yomi, they are not really dating."  uh what

"Kris liked to hookup online with some stars (not really sure) since he was in Korea"   double what

"Reportedly, someone from Ikon is bi"  wouldn't be surprised if it were Jinhwan lol

"Suga is dating now"  I thought they said he wasn't interested in anyone...?

"someone in Winner is gay"  Pretty much in every group there's at least one who isn't totally straight, js

"a lot of young male idols like to date unnies that are much older than them"   *noonas. great news for the noonas tho XD

"There is a gay and a bi in VIXX and once pursued someone from exo. However, all of exo are straight."   I don't buy this one.

"Quite a few members in T-ara have rich boyfriends"   lol

"Yuri and Hyomin are both bi and have been with girls before"  Yuri is everything but a surprise

"Same- relationships are quite common in Korea, especially guys with guys but most of them are in different groups "  Whatever, just give me the OTPs ffs

"Lay was once pursued by a second generation Chaebol (a guy) for real and the guy was quite persistent"  he was

"It is not uncommon for korean idols to be bi"  it is not uncommon to be bi. period.

"Sehun proclaimed at the Han River that Luhan is not trustworthy" I wonder why

"There is a bi in monsta x"  wonho.

Well, nice rumours. There're lot more of them.