A Journey to Another World Starting from the Red Monster

[System + flesh and blood + semi-invincible] (The introduction is weak, please move to the main textฅ՞•ﻌ•՞ฅ) Li Yuan was swallowed by the tentacles in front of the screen and turned into a red monster as soon as he opened his eyes. Lying in the laboratory, he struggled feebly, and could only be continuously decomposed and torn apart, until he seized the opportunity to break free from the cage, and this laboratory, buried deep underground and never seen the light of day, ushered in their end... (World order: Red Monster → Demon Slayer → Black Myth Goku) The protagonist changes as the second chapter is written. If you want to skip it, you can directly read the third volume of Black Myth. There is no problem if you read it separately.