Help find sauce!!

I wanna reread this manhwa but I forgot the name since our reads been cleared

-Manhwa, fully coloured, I think a tap4s original
-The top looks like nanami
-Top was math teacher but secretly an agent he use (his teacher was an alias identity)
-Bottom was an Asian callboy that had a tattoo of a rabbit/bunny (?)
-Bottom was an ex student of the top
-Top needs to use bottom to execute a mission
-They were eating some bomb ass pancakes at some point
-It was set in a western forest snowy setting