MTL - Starting Off Survival With A Small Treehouse - Chapter 431 bizarre underground world

In the twenty-ninth year of the First Emperor, Bo Langsha was attacked.

When Ying Zheng merged the memories of the 21st century history doctor, looked at the mighty mountains and rivers in front of him, and said to himself, “In this life, my Daqin can’t die!”

- Description from novelbuddy

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.

The Final Haven Kingdom.

The last known habitable place for humans. Protected by it's faithful Knights, it's walls were destroyed and rebuilt over and over again, signifying it's strength and unwillingness to bow down before the forces of evil.

Raven, a young man who's soul returned back in time with his memories intact, what are the changes that he will bring to prevent the kingdom's destruction?

Join his adventures along with his family, friends and his lover to find out what is his own Way of being a Knight.

[NO. 4212: ‘Humanity’ has failed the Demotion Match.] [NO. 4212: ‘Humanity’ has been deemed useless. Beginning deletion.] As Earth was being erased after their final game ended in failure, Martial Saint Sung JiHan managed to resist deletion and saw messages pop up in front of him. [To think someone would be able to resist being erased.] [Let’s give him an opportunity to re-challenge.] [Player ‘Sung JiHan’ is returning to the time of initial entry in The League.] When he woke back up, he had regressed back in time. Given a second chance, he swore to himself to stop the fall of Korea and humanity and take flawless vengeance against those that ruined things in his original timeline.

Follow the journey of Korea’s Martial Saint, Sung Jihan, as he struggles to prevent a future of destruction and ascends as the Martial God!