!! Willing to give KARMA POINTS If you can help me get this out of my head

So I just watched a trailer for a movie Snow Flower. It's Japanese. 

Basically the plot is a girl has 12 months to live and she offers 1 million to a guy to be her boyfriend

Now, I AM RACKING MY BRAIN because I swear to god I have read this somewhere URGGFH 

If anyone has read something similar please please tell me (if you'd like I'll even give you karma points as thanks). Right now I'm thinking of maybe most likely an EXO or Seventeen fic but it could be something else too. But I can't be too sure. Or maybe it's a K drama? Something different altogether? Helppp I feel so frustrated