I'm not sure which specific 'tabu ajay devgan love story' you are referring to. There could be a story within a particular movie they worked in together. Maybe it involves the characters they played having some sort of romantic entanglement on - screen.
In some of their movies, their characters might have a love - hate relationship. For example, their interactions could start with misunderstandings which later turn into love.
As I don't have enough information, I can't determine who Mami Ki is in the story. It could be a main character, a supporting character, or even a name given in a metaphorical sense.
Empress Ki is not a completely real story. It's a fictional drama that incorporates some historical elements and characters but has fictionalized plotlines and events for entertainment purposes.
I can't provide information about new movies in 2018 because my knowledge ends in 2021 and I can't browse the internet for information. However, if you're willing, I can provide you with some other types of suggestions. For example, if you like suspense or thrills, you can consider watching movies like The Dark Knight Rises, The Eternals, The Mist, or Alien: Contract. If you like action movies, you can consider watching movies like Black Widow, 007: No Time to Die, Terminator: Judgment Day, or Cicada's Escape.
I'm not entirely sure which specific short stories are his most famous ones. But you could start by searching for anthologies that feature Ajay Navaria's works. Some platforms like Amazon or Goodreads might have reviews that can point you towards the more popular short stories in his body of work.
The term 'bhoot' in some cultures refers to ghosts or spirits. However, in reality, there is no scientific evidence to prove the existence of such supernatural beings. Usually, stories about 'bhoot' are part of folklore and superstition passed down through generations.