The Immortal Lady Who Subdues Demons

[A whimsical, light fantasy based on the Classic of Mountains and Seas] [No System] [No Quick Transmigration] Yue Wenting and her imperial younger sister are born on the same day. The Imperial Preceptor tells the emperor, "One girl is an immortal, the other a demon." To save her younger sister, the empress insists that I am a monster born into the world, then pushes her and her mother off a cliff.

The Pei family saves her life and sends her to a sacred mountain to learn demon-hunting from a master. Eighteen years later, the gravely wounded General Pei appears before her, saying that the Grand Princess has allied with foreign powers and betrayed the country, while demons and evil spirits run rampant everywhere.

Hah! She's living the good life in the immortal realm, with a cute junior fellow disciple for company. What do the messes in the mortal realm have to do with her?

But from then on, General Pei treats her as his savior. At a gambling den in the demon realm, she sells him as her stake; outside the Heavenly Gate, she steals his soul; inside the giant Kun's belly, she uses him as fresh-meat bait... How does this blockheaded guy still trust her unconditionally?

Her junior fellow disciple is the illegitimate son of the Demon King and an incarnated Heavenly Hound. He's loved his senior sister since childhood, but the sight of a formidable rival turns this puppy into a wolfdog. He protects his beautiful senior sister at every turn, afraid someone might steal her right from under his nose...

The three of them fight monsters and grow stronger along the way, making friends throughout the Three Realms: the Battle-Hardened Monkey King with a roguish face; the black cat demon who is a monk yet has more luck with women than anyone; Zimisha, the seductive, money-loving princess of the demon realm; Abu, the scheming and wise owl strategist; and the vampire Bat Qiansui, who spends all day rubbing his belly and crying that he's hungry...

By the time the heroine returns to the imperial city to settle the score with the troublemaking Grand Princess, not a single person in the court is human.

A guaranteed happy ending, and absolutely no filler.