MTL - Class Teacher System - Chapter 90 This world is unscientific

I returned after 10 years.

The first-ever virtual reality game, New World. {The time has come.} {Synchronization starts.} That marked the beginning of the catastrophe. As the game became reality, the Earth began to crumble. However, there was hope. All-Master Jeong-hoon, who had survived until the very end, was just one step away from finishing the game. “Gah!” But ended up being betrayed by his comrades. “Should I say, from the moment you said you wanted to end this game?” The reason for their betrayal was simple, if the game ended, their power would disappear. The moment they thought it was all over. [An unknown mysterious force is protecting you.][An unknown mysterious force is sending you back to the past.][Warning! The system attempts to intervene… failed.][Warning! Warning! The system attempts to intervene… failed.][Warning! Warning! Warning! The system attempts to intervene… failed.][An unknown mysterious force dissipates.] Thanks to that unknown force, he returned to the past.

Once upon a time, an Alchemist Grandmaster from the World of Immortals accidentally took possession of a playboy, who hailed from a rich and powerful family, and became a student in the middle of his midterms.

By the means of a miraculous immortal technique, he blended in and mingled amongst the femme fatales’ group to dominate the city! The nature of this novel’s origin is shamelessness to the core; having no sense of shame is just a basic foundation, but if the most shameless isn’t set yet, then become it!

- Description from Novelupdates

5 years after the world changed, the final boss appeared.