This song by BoA is in F.
The chords in brackets are transitional.
These are the “cheat” chords I played…
Part 1a: BbM7 - Am7 - Gm7 - F
Part 1b: BbM7 - Am7 - Gm7
Part 2a: Same as Part 1a
Part 2b: Bb2 - F2 - Dm7 - C
Part 2c: Dm7 - B2 - F2 - C
Part 2d: Bb2 [...]
