Toaru Majutsu no Index: Genesis Testament - Volume 3, Chapter 1: A Scab Torn Away – City_Warfare.

His Royal Highness the King of Han, who was afraid of the dark and ghosts and loved to cry, has always been the good baby of the princess.
Until one day, His Royal Highness the King of Han found a book in the bookstore…
Picture book?
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Search keyword: Protagonist: King of Han, Princess of Han

- Description from novelbuddy

“Gege, what does cultivating feelings mean?? Is kissing when you eat someone’s mouth?? How are children born??” The 3-year-old Xiao Tu likes to chase after her ChangZhi gege and ask questions…

Ten years old Cheng Zhiyan had always seemed been studious and hardworking. However, when he heard these three questions, he was stunned and fled in an instant… until one day, a certain thirteen-year-old Xiao Tu pressed Cheng Zhiyan to the wall and kissed him. Then she smacked her lips to savor the taste and said: “It turns out that when you kiss orange juice, it really taste like orange juice ah…” the always calm and indifferent Cheng ZhiYan, once again fled in defeat.

**TN: ChengZhi Yan’s name sounds like orange juice

- Description from Novelupdates

“I was nothing... and now, I have one chance to steal everything.”In his previous world, Ethan was just another failure. No talents, no dreams, no hope.But death wasn’t the end it was a new beginning.He wakes up in the body of “Valerian Lucard,” the son of a great family... but the weakest among them. Neglected, shunned, broken.But this time, things are different.He has an unbelievable ability:Fate Theft.Skills, talents, future opportunities... he can steal them, but at a heavy price.And the worst part? What’s stolen... never lasts.Now begins his race against everyone: the elites, the geniuses, the chosen heroes.Not because he's strong, but because he refuses to be nothing... ever again.In this world, either you steal glory... or everything gets stolen from you.

Beneath the daily routine, at the end of rationality, outside the world you are familiar with – there is a landscape you have never imagined.When Yu Sheng opened the door for the first time, the world he was familiar with collapsed.And the “truth” that goes straight to the root of the world came to him.