For kpop, literally any BTS song (Fire or Not Today are really popular now), or Don't wanna cry by Seventeen. That and TT or Signal by Twice. You could use the new G Dragon song too. I think it's called 'untitled.'
As for pop songs, my kids really like Shape of You by Ed Sheeran and Uptown Funk by Bruno Mars. And also Love Yourself by Justin Bieber.