MTL - Into Unscientific - ~ A New Year's letter to book friends

[Female Protagonist Synopsis]:Mia Ginger experienced a trial marriage.Before the trial marriage--Dad said: “Koa Jackson is a postdoctoral fellow, watch your words and deeds.”Mom said: “Since you don't like him anyway, why not let your sister have him.”Brother said: “Shameless, stealing big sister's beloved.”Sister said: “Why didn't you come back a month later!”Mia Ginger didn't understand, she was already seventeen years late, late enough that the whole Ginger Family completely forgot her existence, late enough that the adopted sister occupied seventeen years of affection, late enough that the man she was betrothed to almost became someone else's groom, how much later should she be?Mia Ginger curved her lips: “Grandpa Jackson, I will strive to be worthy of Brother Jackson.”She thought it was out of spite, unaware that upon meeting him again, she discovered he was the big brother lingering in her heart for nearly ten years.At two years old, she got lost, falling from a Rich Family's Daughter to a street beggar, picked up and raised by a masseuse for seventeen years, and upon returning home, she was determined to become the first socialite in upper-class society.[Male Protagonist Synopsis]He is Koa Jackson, the third son of the Jackson Family, elegant and upright, with outstanding looks, the youngest neurosurgery professor in the domestic medical field, known by all.Simply because, at twenty-seven, he remains single.All young ladies want to marry into the Jackson Family, unaware the nobleman was betrothed since birth.In his entire life, he need only remain pure, waiting for one girl to grow up.Before the trial marriage, Koa Jackson had seen his future bride twice.The first time, he was eight, she was eight months. He stood by the bed watching her crawl with her little bottom, finding it amusing, he wrote his name on her sole and said with a smile: “Brother will stamp you.”The second time, he was eighteen, she was ten. He stood by the road watching her sneakily stealing, feeling pity, he took her hand and gave her a hundred yuan, helplessly saying: “Not stealing is a good child.”He's always remembered the first time, long forgotten the second.Unexpectedly, the little girl whose foot he tickled at home always regarded the second time as her life's salvation.[He couldn't partake in her turbulent past, but wholeheartedly takes on her prosperous future; companionship is the most touching confession.]

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

A 34-year-old NEET otaku, chased out from his house by his family, found that his life is reaching a dead end. He then recalled that his life could actually have been much better if he had made better choices in the past.

The master Xiuxian failed to cross the calamity, the soul came to the earth, and became a waste fiance of the school flower. The school fiancee wants to force him to remarry, the hypocrite and uncle who is greedy for money fights for his family property, one indifferent killer kills his life … Grandpa’s disease must be cured … The proud family’s family must learn martial arts with him … These problems are being cultivated Master Lin Mu is not a problem before him!

- Description from 69shu