it's okay not to be okay is totally the best one i've watched.. also the only one i've watched.. but it's pretty popular so you've probably seen it already. imitation is also really good but if you're trying to steer away from like kpop/k-idols then you probably won't like that one because it's about fictional idol groups. and a lot of the cast is from groups like ateez, i.o.i, etc