SpiderGwen: I have a system?! - Chapter 36 - : Solo Mission

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

Stella Wilson, a nice rural lady who went to New York to pursue her Veterinary degree. Also, she works part-time as a pet sitter to a three little cats. Her boss, Alice Adelson instructed her to keep the cats away from the next-door neighbor Sebastian, the billionaire. An Alice cat, however, managed to escape from Stella's care and make the way to Sebastian's property, where caused her trouble. Stella is caught by Sebastian while trespassing his property.Sebastian informs her that she must keep the cat away or else he would punish her. Sebastian has already made the decision that he will going to own her and has stated that she will be responsible for the payment. But it's not in monetary value that he's looking for.

“Missus, time to fulfil your duties!” Mu Yuchen demanded as he pulled Xi Xiaye closer with his arms intimately wrapped around her waist.

It was a meticulously planned feast for the powerful. Her fiancé had knelt down on one knee and proposed to her sister instead. Robbed of her right to her inheritance, she was prepared for the Xi family to throw her to the wolves.
As she slipped away from her family that had turned their backs on her, she found him — Mu Yuchen, the low-profile and reserved noble that ruled City Z and led Glory World Corporation.

“Mu Yuchen, let’s get married!” He looked up at her, then suddenly stood up.

“Where are you going?”

“Let’s go. Any later and the civil affairs bureau will be closed.”

- Description from Novelupdates

In his first life, he was Wu Taro, in the second, Uchiha Taro, and now, Mu Taro, also known as Master Roshi. Having 300 Years of time to use before the beginning of the main story, Mu Taro star his Journey to become the strongest.___________________________________PS1: The author of the book only adapts Dragon ball, Dragon ball z and Battle of Gods.PS2: The author does not watch Dragon Ball SuperPS3: There is no GT.PS4: The real name of Master Roshi was never revealed, so the Author made a original one.