It Turns Out That I'm a Half-Demon Heir!

What? My older sister, who's pretty but lazy and abused me for fun, was born from different parents than me? What? She wants to become a superstar? Fortunately, I have a System to help cheat her way to stardom. What? My parents asked me to help her find a boyfriend? I’m still single, too, why don’t you guys care about me? ! The System suggested that my sister and I are quite compatible, and the System can help pair us up. No way! Being her brother is already bad enough! 

(Source: Tencent, translated)

When Li Xianyu was 20 years old, he received his father's inheritance, an 18-year-old great-grandmother who was incredibly beautiful.     
Li Xianyu: "Great-Grandma, why are you so young?"     
Great-Grandma: "That's because I died when I was 18 years old."     
Li Xianyu: Σ( っ° д°;)っ

[Original Novel](https://www.qidian.com/book/1012894975/)    
[Official English](https://www.webnovel.com/book/so-i-am-a-demon-descendent!_14020594905012305)