MTL - Naruto Lineage Theory? Trash - Chapter 21

500 years ago, Chen Xi was devoured by a crack in the void and was transported into a cultivation world.

500 years later, he returned back to Earth after enduring through several hardships and discovered that only 5 years had gone by.

…

In the courtyard, beauty at the side, a candle flame wavering.

A gush of clear wind, half a full moon, the peach tree remains unchanging.

…

Wait, whose kid is this?! Why is she calling me papa? Gazing at the little girl in front of him with skin as pale as jade, Chen Xi froze.

…

　
Returning home from cultivation, starting as a stay-at-home dad.

In this life, not fighting to be a king nor claiming to be a tyrant, only praying to peacefully be a wife-pampering mad devil and a child-protecting daddy!

- Description from Novelupdates

Bai Yixi accidentally slipped into a book and lived in heaven and earth as a child.

What? ! The sickly little boy who treated her as an enemy when she was little is the hero!

What? ! The boy she bullied and cried when she was a child is the male partner!

What? ! The girl who was deceived from candy when she was a child is the heroine!

Also, she turned out to be a cannon fodder female supporting role. For a moment, Bai Yixi was confused in the wind, and then Yixi ran away decisively.

Three years later, she returned to high school.

Wait, male protagonist, weren’t you from the Eleventh Middle School next door? ?

Wait, male supporting actor, aren’t you gentle with the heroine? ?

Wait, hostess, why are you so jealous of my gaze? ?

Male protagonist: “Is it difficult to love me?”

Male supporting actor: “Without you, what use would I have for this championship?”

A certain Yixi: “Where is my original male lead and supporting actor?!”

Yixi wanted to escape again, but was trapped by a certain boss. The boss’s eyes were dark red and there was a cold smile on his handsome face: “If you run away again, I will die in front of you.”

Bai Yixi shouted: This is not the male protagonist I know. The male protagonist in the novel does not have paranoid and morbid attributes!

Seeing the increasingly darkening male protagonist, Bai Yixi gave in decisively: “Come on, kiss me, don’t be angry!”

ps: 1. The male protagonist has a split personality.

2. It is an extraordinary world with supernatural and fantasy elements.

- Description from novelbuddy

Beneath the vast and infinite starry skies of the universe, countless tribes engage in endless strife, and the flames of war remain unquenched.Rising from insignificance, he possessed no exceptional talents, except for the ability to draw upon the fruits of cultivation from the future.Yet, in a single night, he understood the Dao, and took a step that shattered the shackles of life.With but a thought, he grasped the universal powers, casually breaking down the barriers between spirit and reality.To him, even the most profound and enigmatic of secret tomes were as simple and dull as children's books.Still, he had to go back and fill in the gaps of his cultivation...Some appeared to be glorious, unparalleled geniuses.In reality, they practiced like mad in the shadows to repay their debts...

He became a teacher at the best magic academy in the empire.
….For being mistaken for someone else.