miminunu

The mc crossdress as a girl in the ml's grandfather's house.
The mc was somewhat a caretaker and a companion to the grandpa in exchange for money given by the ml's father.

The ml came back from abroad and was suspicious, later on they became friends.
They rode bikes together, eat ice cream and play the piano.
Then, they met up years later, the mc recognizes the ml.

I'm open to any guesses~~

Fairly popular novel i would say - fanart on twitter - mc look like kim dokja - with a white coat - his
profession is related to the ocean - prob a researcher - the ml is a buff dude - with skintight swimsuit - lots of chibi animal drawing in fanarts

I remember last year the novel does not have any translation in novelupdate at the time.