MTL - The Apocalyptic Master of Synthesis - Chapter 2 First kill

A man is reborn into the world of Avatar: The Last Air Bender as a waterbender from Katara's tribe. Best of all, he was the same age as her, and he had a system with him to help.He knows the future and a system that lets him continuously get stronger by completing quests or long-term missions, as well as giving him the ability to copy abilities from others for himself. He will become invincible in the world of Avatar, even more so than the Avatar himself.

This story is a rehash of the Pea Princess but set in ancient times. It tells the tale of an elegant maiden, and a doting, loyal puppy who also happens to be a rugged hunter! He was serious about pampering his wife! Yue Jiaojiao woke up in the body of a beautiful girl who was grievously injured from leaping off a cliff. If she hadn’t been rescued by a hunter who was passing by, perhaps she would have died. Looking at the soft, delicate “little fairy” in front of him, the rugged hunter decided he would play the role of a loyal puppy to the max!

The delicate Jiaojiao was a clean freak, so there would always be hot towels ready all day long. Jiaojiao was being disturbed by her uncle and aunt? Hurry up and sever all ties with them! Jiaojiao’s feet hurt from walking? My arms are capable of lifting her! Jiaojiao said she wanted to marry me? Zhao Zhan was stunned. Was this real? Was this not a dream?

Generally, Yue Jiaojiao would never have offered herself in return for being rescued. However, the rugged hunter was too awesome!***As time passed, Zhao Zhan realized that his wife was a real lucky star. Ever since she entered his life, he had happiness! And wealth! Even those evildoers who framed Jiaojiao had already been dealt with! Still, in comparison to his material possessions, Jiaojiao will always be the most precious gem in his heart. She was the treasure that he would pamper till the world’s end!

Roy’s life was nothing special. The only thing commendable was the last few moments when he saved a mother and her child from a drunk driver.
…
It’s really an egg! Damn it, what kind of monster have I become? Did I fall into Hell instead of making it to Heaven??
Join Roy as he ventures through various worlds with the Custom Made Demon King System—a system that allows Roy to draw anything he can imagine and create it through exchanging souls!

A lifetime ago, Chu Xun was shackled and thrown in jail on false charges. For three whole years, he suffered extraodinary torment from his cellmates every day. Even though he had escaped death many times, he still died from his cellmates’ fists the day before he was to be released.

After death, Chu Xun transmigrated to a different world of cultivation, where cultivation was the one true path. Carrying the weight of his hatred, Chu Xun began to cultivate in hopes of becoming an Immortal Emperor, who could manipulate heaven and earth and travel through time. After painstaking cultivation of three thousand years, he succeeded. Then he sacrificed all his cultivation without hesitation and returned to the day before he was to be released.

This life, he wanted to find out the truth and the one behind his murder in last life. He would continue to cultivate and strengthen himself so that the tragedy would not repeat itself. He wanted to master his own destiny.

In this life, what people would Chu Xun encounter and what experience of love and hate would he have with them? What difficulties would he encounter and how would he overcome? The answer is the book.

- Description from Novelupdates