MTL - I Was a Group Pet In 80 - Chapter 144 you use it first

As Mingguang Sect’s esteemed Immortal Master, Yi Ning had never experienced much heartbreak and suffering. He had always expected his life to be smooth-sailing, and was only waiting to ascend before marrying his disciple with whom he shared mutual affection.

However, he had never expected that on a rainy night, his disciple brought back a childhood friend.

They were close and intimate, to the point… of sharing a bed.

Standing before the bed where they were entwined, Yi Ning’s heart was as cold as sunken ice. He had wanted to end it all cleanly and straightforwardly, yet had never expected that his disciple not only wanted his childhood friend, but wanted his Shizun too.

His disciple shattered his spiritual core and laid down a hex, throwing him into the main hall to await nightfall to consummate their relationship.

Just as he had fallen into despair and wanted to end his life, he unexpectedly discovered a strange book. The book detailed his life, and the him it described, from beginning to end, was nothing more than a tool used to satisfy his disciple’s desire to conquer, lowly and wretched as a cultivation furnace.

Yi Ning’s head spun, and his heart gave birth to a strong hatred. He dragged his wrecked body to the back of the mountain and released the Demon Venerable Yan Xuan, who he had personally sealed nine years ago.

In return for undoing the seal, Yan Xuan would aid him in escaping.

After the man heard the reason why, he leaned against the wall and smiled with a hint of mockery. Yi Ning had thought he was going to ridicule him for having deserved it, being betrayed by an ingrate who bit the hand that fed him.

Yet, what he never expected was for Yan Xuan to reach out and tug him into his embrace, and the words that left his mouth were instead:

“You fool, I’ll help you take revenge.”

After this, he killed all those who wronged him, and cradled him close to his heart.

He wants to shatter your cultivation and mangle your limbs, to turn you into a bird in a cage, free for him to humiliate.

Yet, with this lowly and dirty heart of mine, I want to pull you from the swamp and cut down the heavens for you.

- Description from Novelupdates

Luciel Ashford was a powerful vampire hunter who fought for humanity's survival in a dystopian world that was being overrun by supernatural creatures.After being sent on a simple mission to eradicate a vampire nest that appeared near one of the human colonies, no one expected one of the most powerful beings to appear - the vampire king, Alukah.In a big showdown that was thought to be the start of a new era, Luciel faced off against Alukah. He won the battle but at a price. That night marked the fall of humanity's hero.Turned into a vampire, discriminated and hunted by the humans he fought for, he is going to answer their call for help once more to protect the people he cares about.Torn between the two worlds, he is going to climb back to the top, forging his own path while still trying to keep his morals intact.“Well, I have a message for you, god. Screw you!!!”_______________!!!WARNING!!!For those who came for the system, you can expect it to see after ch80. Reason being is that the focus is more on cultivation.The system is just a tool for better understanding of the story that's about to come!

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Gu Ting Yu is a veterinarian with a fear of animals. Haunted by the same nightmare all these years, he is desperate to find out the reason behind those dreams. He then travels into a fantasy realm by fate, entering the Palace of the Twelve Sacred Beasts.