I can return to the age of mysterious - Chapter 1256 - 628, it’s the first time eating so much that I’m stuffed (4000)_2

[However, due to mysterious anomalies during host's initial awakening trial, the Aetherfall protocol has been permanently altered.Host will be subject to mandatory sequential trials even after other hosts have been offered options to trials— ALL TRIALS FOR HOST WILL BE MANDATORY.Until Paragon Ascension has been exceeded.Failure to complete any trial will result in the utter and irreversible termination of spirit and vessel.In summary:Host will either survive or be terminated.]---The regular nobody, done in by Truck-kun after being... distracted,transmigrates into the body of a side character from his most hated novel—during the awakening trial.Somehow, he finds a way to survive... or so he thought.In a world where everything revolves around the MC, a side character destined to die can only bring bad omens.He's given a near-impossible task by the trial system of this world—along with no option to reject other than death.And in a novel where characters were once one-dimensional, they’re now being seen from every side and perspective—things are far more complicated than he ever imagined.A world where heroes are hidden psychopaths, villains are deeply misunderstood,teachers are unstable, and teenagers are... Let's just say hormonal.What could possibly go wrong?

Power and desire, money and strength, conscience and responsibility, the road ahead is at a loss, as a time traveler, Simon, where will he go, this is a leading mainstream novel with a relaxed daily life and a slow pace

- Description from novelbuddy

In a fascinating new world, Sam finds himself reincarnated as a developer of unique simulations for a society of monster hunters known as “Hunters.” These skilled individuals employ advanced simulations to sharpen their abilities and acquire new skills essential for their dangerous profession. Drawing from the popular video games of his past life, Sam crafts immersive experiences that challenge and prepare the Hunters for the perils they face. As he navigates this thrilling realm, he discovers the impact of his creations and the true essence of bravery in the fight against formidable monsters.

“Finally,” he thought, stepping through the spatial membrane, into the vast and dangerous `Primordial Dimension` where life and death are infinitely close to each other.Dying unexpectedly, Shane found himself in the body of a newborn baby, within a strange, foreign world.The foreign world, inhabited all kinds of terrifying beasts which escaped from the Primordial Dimensions in order to create havoc on it.Even though humanity was on the brink of extinction, the Primordial Dimensions provided an unimaginable opportunity to reach higher realms, while imminently threatening them with the possibility to be conquered by foreign races.But who would have thought that the destructive and cruel Primordial Dimension where monstrous existences emerged from, would one day become humanity´s ray of hope?Becoming stronger and wielding elements by absorbing mana was not a dream anymore, only to notice, that everything was not as simple, as they initially thought...Follow Shane Suro on his journey through the vast Primordial Dimensions where he learns about freedom, friendship, cruelty, loyalty, and betrayal.