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FL transmigrates back and forth between the two worlds while maintaining her original body (only the wolf ears change)
ML's previous life happened in that world and timeline.
ML's previous life happened in that world and timeline.
FL regressed into her 8 year old body, but alternatively regains her original adult (22 yo) form in the story
ML got isekai'd into another world in his own body
ML transmigrated into another world and body, but eventually goes back to his original body while still in the new world
FL, a Joseon palace maid, travelled to the future in her own body instead of reincarnating
Her previous life happened in that world: she was a powerful dragon that later reincarnated as a human
FL's previous life (as a goddess) happened in that world and timeline, and her family and other characters knew of her existence. ML was literally her boyfriend
FL's previous life happened in that world and timeline. Or better: she reincarnated 80 years later as her own descendant
Muttsuri Akazukin-kun kara wa Nigerarenai