I recently watched Reply 1997 and I love the relationship between the lead. I'm looking for a drama (doesn't matter what language) that is similar. The childhood friends has to grow up together (not looking for any dramas with them being separated for so many years), so that they have the close relationship.
In Time With You (Taiwanese drama) is exactly like what you are looking for, and it's really good.
I think 9 end 2 outs is like that. :)