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The story is definitively very enjoyable when everyone is still in prison but it truly hits its stride once they are able to escape the prison since they are put in a fresh situation where all of the required backstories and 'lore' has already been explained which allows things to occur at a quicker pace, not that it was slow before of course.

The Protagonist: His name is revealed at the end of 100 chapters long prologue iirc. He describes himself as a scammer or an actor acting on the grand stage of this dystopian world. All his actions initially were mostly geared towards his own survival and avert the future. At the end of prologue. He begins to care for the bonds he forged and believes the foundation of those relationship was built on lies. So since he deceived them, he judges that he isn't their comrade after breaking out of Tantalus he disappears from their lives.

The Regressor: At the time of the start novel she is on her 14th Regression and MC who read her thoughts more less decides to live in moderation and avoids getting killed.

The Dog King: Ruler of the dogs and just like dog she possess innate loyalty and affinity to humans. She never accepts any requests that indirectly or directly harms humans

The Progenitor of The Vampires: Silver haired girl on the color. She is a primordial being who lived for 1200 years. Who just is wasting away without a will to live as she can't even kill herself. Her heart has stopped beating, and she became apathetic. She is literally the female version Yu-Jitae from Kindapped Dragons. It's only with the help of the MC she is able to piece her heart together. MC is the only one who is able to make her heart beat, albeit temporarily.

The structure of the magic system is well thought-out.

There will be political struggle involving the MC in the future chapters, and which helps drive the plot further.

Well portrayed worldview.

Also, the way the author sheds light into MC's background is intriguing.

When he discovers that the regressor hates the government, he immediately says he's a government agent, and then when she (understandably and predictably) tries to cut him in half (like he just watched her do to a government golem), he flails his arm and through a one in a trillion coincidence deflects the sword swing of a master swordsman wielding a legendary sword, one that was also invisible.

Even falling into the prison would have killed him if not for the government wanting to increase the number of prisoners (for some reason).

Add that to the super strong character who literally acts like a dog and follows his orders without a question, and it's hard to see his continued survival as having anything to do with his own capabilities.

Hell even his mind reading ability is just something he was randomly given by luck, if anything he's about as blessed in life as the literal time traveler, and that really blunts any admiration one might feel for his accomplishments.

This story is about an Evil force wanting to destroy the humanity and whole world and a Regressor fighting to stop it. They may want to reset or perform some mass cleansing. Think it like Nazis getting so powerful and delusional that they think that whole Humanity is tr*sh and they want reset.

Regressor is a girl without talent. She is a normal village girl tasked with saving the world. When she does she goes back in time so she is numb to pain and emotions in general. Final boss is called King of Sin who is a female boss and weild all the power of humanity and demon gods, well demon gods here are just pioneers of humanity who discovered concepts like Electricity, Blood Transfusion, and other things, they are called demon because church don't want humans to get this knowledge.

Anyways in each timeline Regressor dies without any damage on the King of Sin. Why so. Answer is below lol.

Now in this Regression she met MC who is able to read minds. He is a big shot hiding as a small time crook. He is different than Regressor, he is talented to learn anything but his body is weak. His power is unique just like Royal family of few countries of humans. But he is not some Royal but King of Humans.

Every beast has their representative in this world, a King who guides them. On land King of Humans defeated others in past forcing them other kings to walk on human form as a form of subordination. But problem came in form of religion or God. Some one from Heaven didn't like the King of Human who had the ability to learn anything humans do and do it even better. God didn't like the power King of Humans, just think of it as being a Dev watching one character getting too OP. To tackle him it sent Saintess to defeat him.

Saintess was the first Apostle of God. God religion which is based on Christianity says human has ability to do good and only focus on goodness and be better but King of Humans want them to remain as beasts and even accept mu*der and bad things. Due to this conflict few people did came together with Saintess and fought with King of Humans and he as per some agreement decided to accept his defeat.

Humans who defeated him broke his crown and got his powers to some degree. They became the current Royal families. King of Human died and just like other beings, when one king dies another born so future Kings were born but they were weak. They had ability to read minds and learn anything but their body was worse than average and they had limitations on their growth and due to this every new King just live their lives as a common person.

But this changed when MC met with Regressor. As plot progresses MC understood that King of Evil or King of Sin in future is a King of Human just like him as she uses power similar to him. He also came to understand that in previous timelines he died in Abyss or something happened like Evil group draining his power and so on. Also there exist a user of Holy Sword who has power to change shape and possibly daughter of previous King of Humans, so it's likely that Nazi like group captured King of Human and transferred the power to that woman to create a weapon of destruction as the woman will not have will of king of human to prosper the humanity. They basically created the King of Sin to execute whole humanity by drawing the power of King of Humans.

To stop this possible future MC is on a mission to get back his powers as King of Humans and best way is to get technologies of Demon Gods. MC is able to learn their techniques even better than them and his goal is to create even more such Pioneers so that humanity can get stronger which inturn will make him stronger.

Now this novel is a three way War. One side is King of Human and Military State where no Royalty exist and is willing to serve him as he gave approval to their empire as good. Other side is Evil Nazi like group who is hidden in shadows, even in 200+ chapters little details could be found, we don't even know the name properly. And on third side is Regressor who sided with Church to find and kill the Evil Nazi like Group.

King of Human and Military accept humans as beast and due to this both good and bad aspect of humans prosper, it's such a big difference that Military has all kinds of Modern tech and other kingdoms are around 200 years behind. And since he is now the fiancee to Tyr even Vampires are accepted as Humans and become his power. And King of Dogs and King of Cats are also with him. He is very powerful but still Regressor broke up with him because she wanted power of Church to use the Saint who can see future and defeat the Nazi like Group and stop formation of King of Sin. Church and Vampires are enemies and even King of Humans that is MC and Church are enemies. And as it happens Military State and Church are also enemies. So there is are very good dynamics now.

A lot of mysteries are still covered with Haze, a lot of world still remained to be explored. Even with 200 chapters it feels like the start of Journey. If First Part was escape of a Smart low level Thug Hughes from Abyss by using monsters like Vampire Ancestor, Regressor, and a King of Beast, now the Second Part is an epic of the King of Humans Hughes breaking the locks Church placed on Humans and unlocking power of Demon Gods for whole Humanity while fighting against Church, Nazi Like Group, Regressor, and even all the beasts and humans in power who are scared of King of Humans getting his powers back.

Also, one more thing:

Some people here said that he is weak and such. I will say that he is not, he is powerful is a different sense. MC is a beast in form of human. For him Saint is as good as a mu*derer. Both have potential of humanity.

He is not a manipulator but wants every one to live their lives to fullest and die while achieving their full potential. If he feels that someone lacks something he will try to full the gap. He will not stop a terrorist from planting the bomb if he don't have power to do so, but he will motivate victims to do their best to escape while trying to make terrorist his errors and if failed will try to kill them to save himself and others. And due to this unique trait of him everyone, both who loves him and hate him respect him. Yes he is not a Superman or God like being, at best he is like an Elder who want others to do their best and in return they help him without any issue.

So while MC is increasing his power by learning Electricity and other powers of Demon Gods his main power is still the relationships he has with other. Even if Regressor is on side of Church and Church wants to kill him she wants him to live because he gave her hope to break the regression. He is weak but he is a King of Humans who want humans to prosper and try to guide them to the best of humanity and due to this many comes around him naturally and he also become enemy of some who rejects him altogether and wants to kill him.

In the end he is a social beast. He is scared of death and other things like other animals. He is not a powerfull Alpha Male who will match in front of arrows without a sweat but he is a leader of monsters who will hide behind them to plan and order his monsters to fight with anyone who is his enemy and the enemy of humanity.