Yes, I learned simple coding for this, but I also use Ren'py as the base engine for the whole VN aspect. Almost everyone uses it as well!
HAHAH I'm happy to hear it made you like him more, and thank you for checking out Steal Me Softly's grumpy detective.
I wish you the best if you ever want to try making VNs as well <3
(xyx pfp ;) i'm a Quest girlie myself)