MTL - The Kryptonian of a Certain American Comic - Chapter 89 88, Dr. Pym

In her last life, she was miserable and ordinary. This time, she got into the fashion and was reborn in another world. She was still the same person… even with the same body and face. What was the point of reincarnation? A childhood companion? He always pulled her hair and made troubles for her? A handsome boy? The boy never looked at her and was 15 years older than her! A prestigious teacher? The teacher spent his days eating and drinking, coaxed, played tricks, and controlled others… Too scary and better run away? No no no, such a challenging life was bound to be wonderful! Now let me take you back to the 70s and live a fast life!

- Description from Novelupdates

Lu Sheng, who transmigrates to the Star Sea Era, unexpectedly acquires an attribute panel capable of solidifying every single advancement he makes.In this perilous world filled with alien gods, immortals, Mechanical Ascenders, and more, Lu Sheng relies on himself to progress from mortal flesh to the singular True Self.Years later...Lu Sheng flying across the universe, gazes upon the endless darkness at the edge of the cosmos, where a colossal being as vast as the Milky Way Galaxy—once recorded in mythologies of Blue Star—resides.He speaks faintly, “You might be the most formidable Galactic Life Form I’ve ever encountered. Calling you a god wouldn’t be unjustified.”“Yet it’s a pity, for I have already established the foundation of the Great Dao and forged the singular True Self. Henceforth... you may call me the Martial God!”

The most feared Assassin in the world died because of vengeance.