The Apocalypse Is Here, and I'm Already Immortal

(I originally planned to tell the story on two timelines, but scrapped the idea for fear it would get too confusing. Chapter 8 enters the main storyline of Volume One, beginning in 2012.) [Pseudoscience] The element [Un] + not a pure power fantasy [The sun isn't a star + apocalypse survival + no rebirth + invincible through physics + revenge]

The Mayans weren't lying. The extreme changes in the sun's brightness still brought about the end of the world.

The base's laboratory was the first to detect the anomaly, and secretly obtained a special substance called [Un].

Then came the sun's rapidly shortening lifespan and the shocking discovery that the sun wasn't a star!

Although the scientific community predicted that the disaster of 2012 would strike 800 years later, it still arrived ahead of schedule, around the year 2512.

After accidentally drinking an experimental reagent during an explosion, Yang Jian discovered he could heal himself in an instant.

The immensely wealthy Song Group was ultimately destroyed. What kind of story would Yang Jian, now possessing an immortal body, go on to experience...