His name was Chen Xi. Once a down-on-his-luck student in the modern world, he was summoned to another world by the priests of a kingdom. The king and his subjects begged him to save their continent from invasion by demons and soul clans.
He mastered swordsmanship and magic there, took in a group of homeless children, and met many women who admired him.
But the Demon God Belial was too powerful for him to stand against.
So he pretended to turn traitor and joined Belial's forces.
When the human leaders came to defeat him, he died alongside the Demon God in full view of everyone.
His memories vanished, and he became a down-on-his-luck student once more.
During a class, the priest used magic to summon all the students there again.
This was the otherworldly continent a thousand years later, known as the Dawn Continent.
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