Tondemo Skill de Isekai Hourou Meshi - Chapter 270

Stella Richard married Rene Kingston in the place of her sister Sophia due to some reasons. But from the beginning, she knows that her marriage was just a time-limit contract and once the time was up she had to go.For RK, this marriage was just a burden but for her, it was a gift from God. Because RK was the man who she had loved all her Youth...So, in the meantime of her marriage, Stella did her best so that this marriage may work out.But on the day she found she was pregnant, her husband gives her the divorce paper and said...“I don't want this child. Don't forget to abort.”These words come out of his mouth, like a bomb for Stella, and changed her life...She signed her name on the divorce paper and left the house...Because she doesn't want to be with such a cold-hearted man...Five years later...RK bought the company In which Stella worked. But Stella did her best not to have anything to do with him...Because she had a child and she didn't want him to find out about him...But one day When Stella picked up her son from school he saw her...RK, “How dare you had a child with another man?”Stella, “I don't think it has anything to do with you.”RK was about to say more when his gaze fell on the child beside her...His face looked as same as when he was young...

After ten thousand years of cultivation, he could have achieved immortality. However, his lack of human experience led to his failure to attain immortality.Thus, he resolved to immerse himself in a century of human existence, seeking to enhance his journey toward immortality. What he didn’t anticipate, though, was that upon entering the human world, he would find himself cast as a son-in-law, facing disdain not only from his wife’s parents but also from his beautiful wife herself.Armed with a wealth of cultivation knowledge, how could he transform his drab human life?

Li Xu occasionally got a sign-in system, and his life has been different from now on. Enjoy life, look at the scenery, sign in, spring flowers bloom, and face the sea.

- Description from novelbuddy

…but it seems pretty doable.