This song by Bii 畢書盡 is in C#.
Part 1 is the Intro.
Part 5 is the Interlude.
Part 6 is the Bridge (the rap part).
These are the “cheat” chords I played…
Part 1a: C#M9 - C# - C#M7 - C# - C#M9/F# - C#/F# - C#M7 - C#
Part 1b: A#11 - A#m - A#11 - A#m - C#M9/F# - C#/F# - F#2
Part 2a: C# - C#M7 - A#11 - Fm
Part 2b: F#2 - C# - D#m7 - G#11
Part 3a: same as Part 2a
Part 3b: same as Part 3a
Part 3c: G#7
Part 4a: C# - G# - A#m7 - Fm7
Part 4b: F#2 - G# - Fm7 - A#m7
Part 4c: D#m7 - G#11
Part 5a: C#M9 - C# - C#M7 - C# - C#M9/F# - C#/F# - F#2
Part 6a: A#m - G#/C - C# - D#7
Part 6b: F#2 - C#/F - BM7 - G#11
