This song by G.E.M. 邓紫棋 is in Ab.
These are the “cheat” chords I played…
Part 1a: Ab2 - Eb/G - Fm7 - Fm7/Eb
Part 1b: Db2 - Eb11 - Eb
Part 1c: same as Part 1a
Part 1d: same as Part 1b
Part 2a: Db2 - Ab/C
Part 2b: Eb - Db2
Part 3a: Ab2 - Db2 - Fm7 - Eb
Part [...]


 

