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Coming back to your previous lifetime after you become demonic master so now you have to regain your past strength
Coming back in time to save the world (I don't know if there's any more to say about this one)
Coming back in time to save the world in a tower of trials or something similar, whatever
Coming back in time for revenge and developing sexy russian alter ego for public appearances
Coming back in time by committing way too many suicides
Coming back in time to save the world but not being aware of this fact yet
Coming back in time to change your life (your boyfriend loved someone else all his life so you decide to leave him in this one and save your life from illness that killed you in your previous life)
Coming back in time to change your life and save the dog (it's always important to save a dog )
Coming back in time to not let your loved one be lonely
Transmigrating to another world to a body of someone weak betrothed to someone strong
The Descent of the Demonic Master