Answer:
-SM Entertainment. Key artists: BoA, TVXQ, Girls' Generation, SHINee, f(x), Super Junior, EXO, Red Velvet, NCT 127.
-JYP Entertainment. Key artists: Wonder Girls, 2PM, Miss A, Sunmi, TWICE, GOT7, ITZY.
-YG Entertainment.
-Pledis Entertainment.
-P Nation.
