Botsuraku Youtei Nanode Kajishokunin wo Mezasu - Chapter 3-13

Descent of the Phoenix – 13 Years Old Princess Consort

The strongest female assassin from a special assassination force met her death one day on a mission. To her surprise, she woke up in the body of a 13 year old girl, Mu Rong Liu Yue. Through Liu Yue’s past memories, she found out that she was bullied due to the huge birthmark on her face, even though she came from a renowned family. Liu Yue was beaten to death by her own cousin, and that’s how she managed to enter Liu Yue’s battered body. The assassin then decided to live her life as Liu Yue and swore to avenge her death.

- Description from Novelupdates

Ning Xuan was a talented cultivator with a legendary body. However, his bloodline was stripped six years ago, reduced to a waste. Yet after his so-called sister's care, his blood was restored.Yet when the girl heard this news, she said: “As expected of the Nine Nether Divine Body. Its True Blood is this formidable the moment it regenerates! With this, I shall surpass Ning Yang and become the sole Heavenly Maiden of this continent!”

When I opened my eyes, I was inside a novel.