K-pop wan't really on my radar till last year. I'm frequently on Twitch, especially watching miniature painting streams. The one I visit most regularly has song requests enabled, so you can link to YouTube vids and it'll play the audio. Several streams running, one of the other regular chatters requested Twice's Like Ooh-Aah. First couple of times it washed over me, but after hearing it on three or four consecutive streams, it started getting into my head, and I decided to head over to YouTube and see what else they'd done.
That kinda snowballed into watching a lot of Twice, and for a while, it was just Twice.
A while later I was chatting to friend with whom I have a bit of a cultural exchange thing going on; linking each other to cool music and such that we find. I showed them some Twice, and they recommended I check out a Japanese singer called Ayumi Hamasaki, particularly a song of hers called Fly High. I liked it, followed her on YT, but in the recommended list was another song called Fly High... by Dreamcatcher.