Shota's Isekai NTR Adventure - Chapter 816 All eyes on her

A skilled but unfortunate modern-day assassin was killed in a freak accident. However, he soon found himself summoned to another world by an evil wizard, who had him possess the body of a boy as an experiment. After successfully planning the evil wizard’s downfall, he used the wizard’s body as a springboard to gain influence and power in his new world.

- Description from Novelupdates

When the protagonist woke up, he discovered that he had become Song Qingshu, who had his meridians destroyed in a contest of martial arts and was banished from his sect. He also found out that this was a chaotic world that incorporated Jin Yong’s 14 novels. What will he do now?

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