OP said magic shop reminds her of Keigo Higashino's novel Miracles of the Namiya General Store. There's movie as well.
It gives advice turning magical 1 night. Accidently, the time line switched somehow makes the current present&the best present for the ppl who want to be advised pic.twitter.com/hZ9crGJQ3T

— (hiatus)아미살롱 ᴀʀᴍʏ sᴀʟᴏɴ (@BTSARMY_Salon) March 30, 2019