To learn Wjsn - (불꽃놀이) Tra-La chords, your first step should be understanding these chords - A, Bm, G, D, Bm, A, D, Bm and D in sequence. A strategic approach would be to train at 56 BPM initially, and then accelerate to the song's tempo of 113. With A Major as the song's key, tweak the capo to cater to your vocal pitch and chord likes.