In Different World with Naruto System (WN) - Chapter 30 Selling Magical beasts’ core.

Seven years ago, Shen Qianshu is impregnated with Ye Ling’s child in an accident.Seven years later, the little boy becomes famous and is thought of as the nation’s son.

Zhen Zhen was reborn in the forest area in the 1960s with a drop of the blood of the ancient gods. The awakening of the blood of the gods not only gave Zhen Zhen one power after another, but also made her the most favored little lucky star in the family!

- Description from Novelupdates

William and his college class are ripped from Earth and thrown into Aethel, a world on the brink of collapse. Everyone gains incredible magical powers – except William. Mocked and underestimated, he’s an outcast among heroes. But William has a secret: an SSS-ranked skill that lets him travel to Aethel’s past. Learning lost magic from ancient masters, he’ll surpass his classmates and become the true savior Aethel needs. But can he overcome the dangers of the past and present to forge his own destiny? While others studied about the first mage, William could go back in time and see the first mage himself! While others dreamed of seeing a dragon, William could go back in time, hatch a legendary dragon egg and turn it into his puppy. While others used common materials to craft their items, William could go back in time and mine materials that weren’t find anywhere in Aethel anymore. Is it unfair? Perhaps, but William was not the type of person to not use the powers the universe gave him.

Zhao Xu goes back 10 years in time to the day when Arthur’s game servers opened. Only he knows that one year later, the earth will be destroyed and everyone on earth will transmigrate into the world of Arthur! PS: MC is a double character class of Wizard and Archivist, training in both the arcane and the divine, includes metamagic/magic guards/spells/rubies/action points/hyperactivity/pause/temporary effect/activation/in-game purchases in the making.