timster they are definetly very oldschool, but one of the members sunmi has really good solo songs (24 hours, full moon) and i love their songs so hot and tell me. After like a 4 year hiatus or something 2 members left and the remaining members are having a comeback with a band concept out of nowhere. kinda random but they seem to be keeping their retro style
but i wouldnt say you like kpop just from knowing one of the like 4/5 songs that went viral in the us lol (the others being the boys, gee, i got a boy, and anything psy does) this is like the (overrated) tip of the iceberg