Progression
The ii–V–i (minor) in G minor
ii–V–i (minor) in G minor plays Am7b5, D7 and Gm — iiø, V and i — across 3 chords. The minor-key version of jazz's core cadence: a half-diminished ii, a dominant V that borrows the raised seventh, and a minor tonic.
The chords, in order
1Am7b5iiø
2D7V
3Gmi