Which Korean Artist 또는 Korean Group Was Your First?

의해 "First" I mean a Korean artist/group that got 당신 to really 사랑 this genre. For example I was first introduced to K-Pop 의해 PSY's "Gangnam Style", but I fell in-love with K-Pop during EXO-M's Overdose era, therefore my "First" was EXO-M.