K-Pop and J-Pop are extremely different. People here haven't even been giving you J-Pop, just Anime stuff.
K-Pop recommendations:
- TVXQ
- Shinhwa (My personal #1)
- BIGBANG
- MBLAQ
- SHINee
- B1A4
- EXO
- B2ST
J-Pop recommendations:
- Arashi
- KAT-TUN
- Hey! Say! JUMP
- NEWS
- Kis-My-FT2 (Probably the best representation of what J-Pop is overall, whilst being easy on the ear)
- Kanjani8
- Dai Hirai
- w-inds.
And for extra...
J-Rock recommendations:
- Girugamesh (Sometimes referred to as the "Japanese Linkin Park")
- D'espairsRay
- the GazettE
- lynch.
- Dir en Grey