Naruto: The Mist Within - Chapter 52 - : Reflections in the Mist

A reputation as ‘The Most Feared Gunslinger In the West’, and the Law hot on his heels, Henry Morgan had lived a full life. So when it all ended with a gunshot to the back of his head, he was quite ready. He embraced death… He embraced his end.Except it wasn’t the end…Some mysterious [Powerful Forces that be] wrenched him out of the world he knew and deposited him into the body of a version of himself in a Parallel world. A world where something as ‘impossible’ as Magic apparently exists.These [Powerful Forces that be] went a step further by granting Henry a System and issuing him strange prompts and Quests that send him down a road of Adventure and bloodshed all so he can etch his name in history and show this world and its many ‘wonders’ just how deadly a Gunslinger can be…

The 7-year-old little crybaby met 11-year-old big brother who ran away from home.
[This man became the protector of redemption in his life]

The 16-year-old little dragon fell in love with a 20-year-old big brother.
[It’s a pity that the big brother didn’t recognize him as the little crybaby]

The 23-year-old single father and 27-year-old chief executive meets again.
[This time the little crybaby and his big brother are finally together]

Fortunately we met through hundreds of millions of people, Thank God, for letting us break through many obstacles and get back together again, falling in love with you and being with you again is the greatest fortune in my life.

- Description from Novelupdates

As we all know, there is a force that must not be messed with in the Southern Region, thatched cottage.

Among them, the eldest disciple is the Qingyun Sword Master of the Southern Region, with a mastery of swordsmanship.

The second disciple, the Eternal Empress, leads an era.

The third disciple is a great Confucianist in the world, and the star of Wenqu came down to earth.

The fourth disciple, the reincarnation of the demon god, suppressed Jiuyou.

…

Lu Changsheng: Me? I am nothing special, just their master.

- Description from novelbuddy

This story is set during the end of the Sui Dynasty, a time where multiple powers struggled for supremacy and power.

Into the fray enters two orphans Kou Zhong and Xu Ziling; these two youths by many chances and luck obtain ‘The Secret to Long Life’ allowing the two to obtain profound martial abilities and a chance to rise to the top in this age of turmoil.