This OST (from Descendants Of The Sun sung) by XIA is in Bb.
These are the “cheat” chords I played…
Part 1a: BbM7 - Gdim/Db
Part 1b: Cm7 - Dm7 - G7b9
Part 1c: EbM7 - Dm7 - Gdim
Part 1d: Cm7 - F11 - Eb/G - F11 - F
Part 2a: Bb(add2) - Dm7
Part 2b: Gm7 - EbM7 - F11
Part [...]
