MTL - The Divine Martial Stars - ~ 40, don't tell you

Zhou Yu, a reclusive otaku, who did not like to go out of his house, was one day forced out of his house by a series of unexpected events.

- Description from Novelupdates

I possessed a character with an intelligence of 100 in a classic medieval fantasy land-grabbing game. An intelligence score of 100. That meant my predictions were always accurate. However, since I was physically weak and didn’t quite understand why that was the case, I thought it best to just live quietly. But then… leaders who began to recognize my ability started to become obsessed with me.

The one single goal in life of the Strongest Old Sage is to subjugate the Demon King. In an epic final battle, both of them met their mutual destruction at each other’s hands.

However, the Demon King was not completely destroyed!

In order to destroy the Demon King once and for all; post-death, the Old Sage trains in the World of Gods and reincarnates as the Apostle of the Gods, Will.

In the reincarnated future, the Old Sage had become a legend and his former disciples hold the supreme authority in the world. The disciples had created an organization to oppose the Demon King and an academy to nurture the new generation of Heroes.

Thus the Apostle of the Gods, Will (8 year old), enrols into that Academy of Heroes.

This is the story of a boy on a mission to save the world through epic battles while enjoying Academy life.

After the heartbreaking execution of his parents due to their lower status and their rebellion against the King of Varanasi. Sukoh Yadav a fourteen year old boy sets of to China along a merchant group to become a great General in China and to conquer his homecountry and abolish the very idea of caste.