[BL] [help needed] Search for a roommate to lover drama

Hello, I'm looking for a BL drama in which a cheerful young man moves into the apartment of another young man (tenant) for a limited time. Over time they develop feelings for each other. The tenant has a girlfriend, which ultimately leads to the blonde man moving out early. At the end the other person visits him in his home country (I think Japan).

Maybe somebody recognizes the story?