It is the story of a girl whose name is Naina. she was very intelligent and a punctual student of the class.the character of naina was very innocent.but suddenlya guy whose name was sameer got admission in the same class in which naina was studying.the naina felt in love with that boy.the story of the serial revolve around naina and sameer.the best part of the serial was that it was the love of old times hence the serial name was given yeh un dinon ki bat hai.the serial is very interesting and reminds of the old tome love story.