Responses
Not really like you want, but worth to try.
https://www.mangago.zone/read-manga/the_last_step_on_the_way/
OMG THIS STORY IS THE EPITOME OF THAT SCENARIO https://www.mangago.zone/read-manga/goodbye_to_destiny/
There is one with Negative Kun and Positive Kun in the title and it feels so good everytime the one who is a stern and serious guy feels happier and looks merrier.
Romance where one isn’t happy but once meets the other one slowly starts to become happier