I Spread my Genes to Level Up in the Apocalypse - Chapter 219 System?

A great demon king who came from another world to conquer Earth. To save the Earth, Li Luyou could only first take care of this great demon king… a little girl proclaiming herself Her Imperial Princess.

- Description from Novelupdates

Kira was living the life that others could only dream about. He was gorgeous, rich and very popular - the kind of guy that drew students from all over the place just so they could brag to others that they went to the same school as him. He was undoubtedly the number one heartthrob that every girl dreamed about.

[Warning: Mature Content]Chuck was a 20-year-old professional body pillow reviewer who spent his days testing anime waifu pillows for online stores. His life was pathetic, lonely, and consisted mainly of rating the softness of fictional girlfriends.Then truck-kun struck.One evening while walking home from another humiliating day of pillow fondling, Chuck got obliterated by a speeding delivery truck. Instead of meeting his maker, he woke up as a newborn in a parallel world... a very different one from the one he knew. A second chance awaited, and he looks to make good use of it.However, he runs into the impossible; Chuck finds himself thrust into a society of proud lioness princesses, fierce wolf ladies, and noble panther heiresses, daughters of warlords.In hindsight, all those years of pathetic pillow fondling had been preparing him for this moment—a world where his wildest harem dreams weren't just possible, they were inevitable.

A man from modern Earth is reincarnated into baby Zeus.Arm with future knowledge of the Greek mythology even if it was little, it still covered major events in the world, he will make sure to be a better and more powerful version of the Sky Father.