MLs competing with... themselves

FL's first love, the handsome older man, was future male lead that traveled back in time

FL's previous life happened in a distinct alternate timeline that still exists, so at one point the 2 MLs meet and even kinda fight (they later fuse into one)

The whole plot is basically ML trying to make FL get over her lover from her previous life, which is his own previous reincarnation that he has zero memory of

FL's previous life happened in a distinct alternate timeline that still exists, and she travels back and forth between the two timelines. By the end of the story younger!ML (current and real ML) and older!ML (her ex husband) are both in her life and jealous of each other

The 2 MLs (the one in Joseon and the one in modern Korea) are one soul that has been split in 2. As of right now, one of the two is already jealous that she slept with the other (I bet they're gonna eventuslly fuse back into one ML)

MC is the only one that remembers their previous life where the other ML acted much worse towards himself

ML is extremely jealous of her husband (object of her love), whose body he possessed, but turns out that he was actually her real husband that transmigrated back and forth all along

ML is terribly jealous of FL's first love, who he finds out died to protect her, but what he doesn't initially know is that her first love is the older him before she regressed

ML feels competitive towards the first emperor, MC's abusive lover in his previous life ('competitive' as in: he wants to treat him better than he did), and is devastated when he finds out that the first emperor was his own previous reincarnation

MC's first love, who ML is terribly jealous of, was ML's previous reincarnation. ML eventually chooses not to regain his past memories and continues considering him a separate person