It was a boss who didn't know it was a nine ball at first sight. To be honest, the difficulty of dual-face seemed to match the name of Nine Ball. LOL 🤣
Basically, the key of the song is F#m and the bass is F#. Synth sounds and phrases are made with A, E, G#. Choir is B. So the chord tone might be F#m7 (9, 11).