Oh dear, this is one topic that I can talk and talk about! In my case, I am part of only one Kpop fandom, the Melodies from BtoB. That doesn’t mean that I don’t listen to other Kpop songs or that I don’t think the other groups aren’t as talented. There are many talented stars out there. BtoB just has a vibe and their songs that really appeal to me 
Mmm, I don’t know what your preferred style of music is (rock, ballad, acoustic, etc.), but I’ll suggest some BtoB songs if you haven’t heard them already.
This is one of their most famous songs:
https://www.youtube.com/watch?v=4bykFvnRzno
Here’s another one: “Insane”
They also uploaded an acoustic version, this is a vid of them performing live:
This one is called “Way Back Home”
This is one “It’s Okay”
https://www.youtube.com/watch?v=SNpuKLfv1EE
Here is BtoB-Blue, a subgroup with only the vocal line:
https://www.youtube.com/watch?v=33GODknx04I
One more 
“Irresistable Lips”:
And there are so many more songs that I love and listen to over and over again. Many of them don’t have MVs, so I won’t list them since that will take forever. When I’m going through good times, bad times, and when nothing is really happening, their music makes me smile and gives me strength. I recently went through a surgery, and listening to their music encouraged me and helped me through. Each member has released solo songs and MVs:
Hyunsik sings “Swimming”
Minhyuk sings/raps “Ya” and “Tonight (with Melody)”
Eunkwang sings “Back Then”
Ilhoon sings/raps “Always”
Changsub sings “At the End” and “Gone”
Sungjae sings so many songs I can’t choose the most popular
Peniel sings/raps “Valentine”
I like to listen to various OST so there are some Kpop songs there too. Oh, and I can’t forget Jooyoung! I don’t listen to all of his songs, but I like the R&B style he has
This song “I’ll do it Every Day” is in the Kdrama Wok of Love
Here’s a song that Jung Ilhoon from Btob wrote and then produced for Pentagon:
“Beautiful”
Here is a girl-group. I usually don’t listen to girl-groups, I tend not to like the concepts, but I like Mamamoo as a group, even if I don’t listen to most of their songs.
“Starry Night”
https://www.youtube.com/watch?v=0FB2EoKTK_Q
As for Cpop, I don’t really listen to that, I tend to listen to traditional Chinese music, Chinese songs from the 80s and 90s, and OST as well. I really really like Jeff Chang’s music–he’s a Taiwanese singer. He’s from the older generation, but I like the vibe from his songs.
Here’s one of my favorites:
I don’t listen to Japanese songs or Jpop, so I can’t give any suggestions there.
I’m a blink and an army and,you know,I really love them! 
I started this discussion for a reason: I want to ask you all what are your favourite k-pop groups. I would like to hear some new songs from new groups,but there are so many korean singers that I don’t know what to do 
I’ve heard,for example,some songs of Girls’ Generation (like “The boys”,“Oh!GG” and “Genie”),Chungha(like “Snapping” and “Gotta go”),Ailee and some others, but I would really appreciate if you gave me some advices,telling me which songs I should listen to in your opinion. 
I love all his OSTs uwu hope you’ll like my recommendations 
And they’re both sooo beautiful in my opinion 
