Toaru Kagaku no Railgun SS - Volume 2, Chapter 4

A con-man and policewoman that are legends of their respective professions suddenly die, then are reincarnated and return to the Tang Dynasty of ancient China as little kids.

Accepting their second chance and forced restart, they choose to use the modern knowledge and specific talents that they have in their previous lives in order to live comfortably in this new life.

- Description from Novelupdates

(Naruto + Single Heroine Tsunade + Romance + Action)A failed author transmigrates into the Naruto world, becoming the younger brother of Konoha’s White Fang, Sakumo Hatake, and the uncle of Kakashi. He gains a cheat ability—enhanced cellular activity.Coincidentally, just before the Second Shinobi War, he participates in a Jonin meeting where he supports Tsunade's proposal ahead of Dan Kato, marking his first encounter with her.From then on, he launches an intense pursuit, winning her heart during the war.Tsunade: “Kawakaze, why do I keep losing to you?”Kawakaze Hatake: “Because I’d like to live a few more years...”Kakashi: “My uncle is amazing, I’m his biggest fan!”Kawakaze Hatake: “Keep it low-key, keep it low-key.”

Meet Gu Yu—a college dropout and a talented incense maker, and at the same time, the rather stoic protagonist of this story. Despite his somewhat introverted manner, he has a tendency to make sarcastic remarks in his thoughts. One day, after saving a squirrel, a windfall (metaphorically and literally) dropped into his lap. Stumbling into the cultivation world with little help, he was not turned into Superman overnight (as he would like). Apparently, becoming a cultivator would not make your life easier, at least in the beginning.

From infancy to maturity, what Ye Zhou dislikes the most was “two”.

The reasons were: he was ranked second at home, he had been forever ranked second at school, no matter how diligently he worked and tried, he couldn’t shake off that “second” curse. What was more exasperating was that, at University, not only was he ranked second, but even his appearance that he was proud of had to be classified as second best!

Why can’t I obtain the first place!

The eternal second will rise!

Then, Ye Zhou, after his vigorous efforts finally rises and the result was… the first became his boyfriend.

This is the story of a man who has been forced to be “second” and how he became the first, most popular.

- Description from Novelupdates