Wake me up when we have these types of boy groups again.

[satoori]

Smokey -  
Sound is just average club music
Style their outfits are just suits mostly. Not uncommon to see 

ADTOY -
Sound is old school like old school Western groups; outdated (I was hardcore stan before this song)
Style mature MV story line concept 

Fiction -
Not sure how to describe the sound. (Probably my favorite song of the ones listed here)
Style feels outdated. Outfit and MV. (So I wouldn't want to go back)

Chained up -
There's probably small company groups doing similar sounds and styles. I don't see anything different here tbh. Many have been influenced by VIXX nowadays too