What company does this singer-songwriter and record producer who worked with this South Korean boy group whose name describes its concept of having multi-sub units based in various cities worldwide?
Yoo Young-jin:  He has produced and written songs for H.O.T., S.E.S, BoA, Shinhwa, TVXQ, The Grace, Super Junior, Girls' Generation, Shinee, f(x), EXO, Red Velvet, and NCT.
i don't know