Dramas where players start out as friends?

I remember Coffee Prince and In Time With You. What others?

Thank you!

The Reply series is all about that and my personnal favorite is Reply 1988. The frienship is really an essential part of the story
Yes! I also love all Reply series!!! thanks!!!
Buzzer Beat (J-drama) - romance/sports
49 days (K-drama) - romance/fantasy/melodrama

I loved both those dramas!! ^_^ :)
Operation Proposal
Personal taste
luv the cast/story in '9 end 2 outs' besties who end up sharing living space and then later realize they like each other!!
Reply series
9 ends 2 out
Ex- girlfriend club
One more happy ending
She was pretty
I need romance 3
Because it's the first time