It is indeed based on a real story. The creators of 'Sirf Ek Banda' took inspiration from actual incidents to shape the plot and characters, giving it a more authentic feel.
Well, without more information about this 'agar tum na hote serial', it's hard to say exactly. It might be a story that focuses on the journey of a character. If it's a typical serial, it could involve family drama, relationships, and the character's growth in the face of different situations. For example, it could be about a character who has to find their way in life when the person they thought would always be there (the 'tum' in the title) is not around anymore.
One strategy for finding love in fanfic is through shared interests. If two characters bond over a common passion, love can blossom. For defeating the tum, if it's a physical entity, they could use weapons or combat skills. Say, in a superhero fanfic, the hero uses their superpowers to defeat the 'tum' while also finding love with their sidekick who has been there through all the battles.
I'm not exactly sure as it could be various things. It might be a story about the relationship between 'hum' (us), 'tum' (you) and a ghost. Maybe it's a spooky adventure where 'hum' and 'tum' encounter a ghost and have to deal with some strange situations.
I'm not sure specifically about the 'agar tum na hote' drama story as I haven't watched it in detail. But generally, it might be about relationships, love, and the impact of a person's presence or absence in someone's life.
I'm not sure specifically which 'sirf ek banda hai' you are referring to. It could be a story related to a particular person, event or local tale. Without more context, it's difficult to tell the exact real story.
I don't have definite information. It could be a mix of real and fictional elements. Maybe check reviews or interviews related to it to get a clearer picture.