its not on mydramalist but i think i've found the best one for you
The Japanese Wife.
wikipedia
imdb
where to watch : https://www.youtube.com/watch?v=Br3K4fkt9fs
yay! luckily its on youtube.
this movie is from india. a love story between an indian bengali man and a japanese woman time depicted during early 80 i guess. they start off as pen pals, then fall in love through their letters and ended up marrying over the distance . A marriage they maintain for almost 20 years after which they try to meet : spoiler no they do not end up meeting, the woman gets cancer, and the man tries to get to think of a cure from the city, ends up having heavy fever and dies. after he dies his aunt sends a letter to japan to his wife that he died. the japanese wife then , as she had already accepted herself as his wife, goes bald and wear white clothing ( a cultural dressing sense when one's husband dies) and finally leaves everything behind in japan and comes to india to live in his house.