Assassin Dad and His Genius Daughter - Chapter 89 A Mother’s Worries

Having been reborn in the high school graduation season of 2008, Li Yuan found himself back at the moment when he confessed to the school beauty...Bai Weixi: “Thank you, being liked by you is an honor for me, but I don't want to be in a relationship right now.”Li Yuan promptly took back the gift he had presented: “Then give me back the gift I gave you.”Bai Weixi, with her beautiful eyes wide, looked at him in disbelief: “Li Yuan, what do you mean?”“You've already rejected me, yet you still want to keep my gift?”“But we are good friends!”“Heh, like I'm short of good friends? What I'm short of is a girlfriend, you get it?”Watching Bai Weixi, disheveled in the wind, Li Yuan turned to ask: “By the way, could you give me your best friend's phone number?”Bai Weixi fumed with anger: “Li Yuan, what are you trying to do?”Li Yuan just shrugged nonchalantly: “Nothing much, she's prettier than you, I've decided to pursue her instead.”

It’s a affair between a loyal dog servant and his master.

- Description from Novelupdates

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

A young man with an extraordinary mind is off on an exciting adventure when he mysteriously wakes up in the body of a feeble slave-guy in a different, rich in quirks world.

The main character, a selfish jerk, would use extreme means to achieve his goals. However, he never allows his base instincts to overrule his sense of decency. He always pays back both good and bad deeds.

Will his (terrible/excellent) mentality help him make a fresh start? Will he get through misfortunes and hardships of the new world?