The title for a BL series from at least a couple years ago is slipping my mind. At the time it hadn't been fully scanlated yet, but for some reason it's not on any of my lists. Here's what I remember about it:

The main character as part of his job regularly visits some alcohol-related traditional Japanese artisan to convince them to work with the company. The love interest is the grandson of said artisan and turns out to also be the IT guy for main character's company.The gist of the dynamic as I remember it is the nation character is smiley, upbeat, and chasing after love interest, who's been refusing for unknown reasons. MC can't take any alcohol at all and in one chapter somehow got drunk off of... manjuu (not sure about this), and needed to be driven home by the love interest.
They might've made plum wine?

Shizuku Hanabira Ringo no Kaori by Kawai Touko