I think it was the Gangnam Style. But it didn't really get me invested even tho I started to casually follow PSY. But then many years later I saw the MV of Blood Sweat and Tears by BTS and the production really surprised me. I started to follow BTS, Blackpink and other groups more casually until (G)idol came to existence and then they did the KDA collab. I've been a Gidol fan since then and I'm becoming more and more invested into Kpop. I'm currently a fan of Kard too.