There isn't enough information provided to accurately tell the full story of 'kaisa yeh pyar hai'. It could be a fictional love story where two characters meet in an unexpected way, perhaps in a crowded marketplace or on a long journey. Their love might develop gradually as they get to know each other's personalities, dreams, and fears. But again, this is just speculation without more details.
I haven't come across the story 'pyar ka dard hai meetha meetha' before. It could be a story that is only known within a certain community or among those who are fans of a particular genre or author. To fully understand it, we would need more details about its origin, the characters involved, and the main plot.
It might be about a couple who are separated due to some misunderstandings, and then they try to find their way back to each other in the 'gum hai kisi ke pyar mein star plus story'. For example, one of them might have made a sacrifice for the other's happiness, but later they realize they can't live without each other.
Well, 'tu pyar hai kisi aur ka' implies that it's a love that is for someone else. In a school love story context, it could be about a person who has feelings for someone else in the school. Maybe it's a story of unrequited love, where the protagonist loves a classmate who doesn't feel the same way. It could also be a story full of jealousy and longing as the person watches their beloved be with others.
The main plot could be that of a heartbroken student. They discover that the person they like is in love with someone else. So they have to deal with the pain of seeing their crush with another person every day at school. They might struggle to move on and find themselves constantly comparing themselves to the other person their crush loves.
Perhaps it also has a theme of sacrifice in love. The pain of love might be due to having to sacrifice something for the beloved, and the sweet part could be the feeling of self - less love that comes with that sacrifice. However, this is all speculation without knowing the actual story.
I'm not entirely sure about the specific 'gum hai kisi ke pyar mein star plus story'. It could be a story from a show on Star Plus. Maybe it's a love - triangle kind of story where someone is lost in someone else's love.