4 Book(s) Related to almighty backdoor

Synopsis
Kael and his family were the outcasts of their society, scorned and labeled as the cursed bloodline due to their inability to awaken any beast in a world where the strength and class of one's beast determined one's status, future, and whether one lived with honor or perished in shame.
But Kael refused to accept a life of servitude and humiliation. He was prepared to risk everything at the Awakening Ceremony for even the faintest hope of a better future.
Instead, in front of hundreds of nobles, he awakened something far worse than useless — a pathetic earthworm that turned him into the laughingstock of the entire academy. At least, that’s what everyone believed he had awakened.
In truth, Kael had formed a contract with an ancient Void Dragon, a legendary beast with the power of endless evolution by devouring the essence of other creatures.

Jack left home at the age of sixteen and spent many years wandering in places where corpses lay in abundance, using killing to end killing. Now, he has become the commander-in-chief of the three armed forces, a legendary general, and is also known in the military circles as the "Son of War", unrivaled in the world.
But just as he returned triumphantly, he discovered that his adoptive father, who had given him immense kindness, had passed away. Upon investigation, Jack uncovered a web of intricate conspiracies lurking behind the scenes.
Regarding this matter.
Jack only has one word: kill!
The tyrannical and domineering mafia? Kill!
A British aristocratic family with a century-old history? Kill!
No matter how powerful or wealthy you are, in front of Jack, this undefeated warlord, the soul of the army, and the general of the country, you can only bow down and submit!

Kidnapped as a child, I was raised in the countryside. When I returned to my bankrupt biological family, everyone mocked me as a hillbilly. Even the fake heiress abandoned the family to marry into wealth.
But no one knew that I am actually the mysterious boss of the Dark Division!
I am a legendary doctor who can bring the dead back to life, a world-famous artist, and a top-tier fighter. I cured my paralyzed brother, saved my mother, and ruthlessly slapped my enemies in the face.
When the all-powerful CEO, Si Shenxing, cornered me against the wall, he smirked devilishly, 'You cured my father. Now, take responsibility for me.'
I sneered, 'Get in line.'

When I turned seventeen, I went to see the local witch and she told me what my future held in store. It would be full of love, pain and anguish. Something I really didn't need.
She told me about my mate. That the time we had together wouldn't be all glitter and rainbows, yet the love would consume me entirely.

The downfall?

He would be the death of me. I mean could a girl not catch a break?

He would be everything you would, but wouldn't want in a man. So now I'm running for both my freedom and my life. From a man I hope never to cross paths with. Now I'm weary of any man that touches me, preying to the goddess that cursed me that I don't feel those sparks.

His name no-one knows, but they call him The Almighty Alpha.