MTL - My Five Elements Lack You - Chapter 1 Initial rebirth

The whole world is subjected to a highly dangerous standardised exam called the Global University Entrance Examination. Answering questions by putting their lives at stake, they would live if they passed the test. Every month the exam will undergo reformation while, occasionally, it is random.

- Description from Novelupdates

The empire has turned into the land of the undead due to a spell gone wrong. God summoned heroes from countless worlds to purify the empire and plant new hope. Lee Shin Woo, an ordinary earthling, was also summoned. As an undead, that is.

Ronald Kuangge transmigrates into an urban novel called “The Dragon King in The World” as a Rich Second-Generation that has to properly play his role as the Villain according to the plot in order to return back to earth.After finishing his villain role accordingly to the plot however, instead of going back to earth he has dreamt so long of doing, he ends up going back to the beginning of the story where he has do everything over once again.So in order to go back to earth, he has to act like a villain according to the story once again.Little does he know this time however, the heroines have also regressed back as well...

Yuki, a high school junior, dies heroically saving a stranger and is reincarnated in a fantasy world, where he discovers an extraordinary and unrivaled power.