NOW I UNDERSTAND WHY THE TITLE IS CALLED RAINBOW!
It's on the Chapters' Titles that are based fon the characters we've met.
First Ollie is Red,
Then Ross is Orange,
The it'll be Sultan cus he's Yellow
Damn I was yelling when thought of it.
Still I'm hooked and shook but it's lovely and good
PS: I predicted that Ross last episode will be sad but in the end I think it was a happy ending considering they talked it through in the night. Ross even gave his pin<3.