[Male Lead Pursues, Quick Transmigration, Very, Very, Very Old-School Angst, The Male Lead Suffers Intensely, 1v1, Scum Bottom Chases the Top to the Crematorium, No Changing the Bottom]
The top is a member of the quick-transmigration agency's cannon fodder group, a lovesick dog who diligently follows the plot and successfully fakes his death. Then one day, the System suddenly tells him his mission has failed and he has to go back and redo it.
Overworked Top: The sky is falling.
Fortunately, when he goes back to redo the mission, he no longer has to play the lovesick dog.
World One (ABO): A pitiful, physically and emotionally abused alpha top who is forced to provide a child x a scheming, ruthless omega bottom who will stop at nothing to climb the social ladder (alpha top and omega bottom, but the omega forces the alpha, not a delicate, dependent wife-type bottom, bottom gives birth)
[The blurb is pending revision and is not the final version. It will be changed substantially, but the core premise will stay the same. If I can't think of settings for the other worlds, this may be changed into a single-world story.]
Theme: Cherish life