The reason being many, I guess..
The concept is interesting and something that many people go through during their teenage. Arnav not being the usually angry and ruthless like in the show but loving and caring one & Khushi being the strong one she is, these two have always been my favourite characters no matter what and always will remain.And her getting to read about the teenage lovestory of them.
Aman had been only in name we heard in the show and never even got a glimpse of, and here the whole story was planned by him.
Love Aman and Priya for being the friends they are.
Aradhana for being the mother she has been and Garima and Sashi also need respect for understanding their daughter and giving her happiness despite the circumstances.
The constant support of all these people made the ArShi here possible..Eventually..
Have loved and adored this story a lot, and must say that it is one of the Beautiful stories I have read.
Hatss of to the writer.