This bodyguard is too invincible - Chapter 838: Battle of the Arrogant Daughters!

A chance to change, to challenge destiny, making dreams a reality, and live a legend! A regular man gains a system that allows him to turn into a fish!

- Description from Novelupdates

Aurora Moon tragically dies in a car accident after a bitter argument with her cold-hearted boss, Alexander Graystone.By a miracle, God grants her a second chance, allowing her to rebirth as a young woman who shares her first name.Just as she believes this new life offers a fresh start, she is shocked to discover that she is married – as the seventh wife.To her horror, her husband is none other than Alexander Graystone.

For unknown reasons, he finds himself transported to a parallel world's Japan, unexpectedly taking over the body of a soon-to-be high school student who had died accidentally. Surprisingly, he did not inherit any memories. However, the first challenge he faces upon arriving here is a language barrier...Just as he struggles to communicate with his new family, a heavenly voice arrives: the black technology system has been activated, and the initial item—translation konjac—has been distributed.This is the story of someone with above-average intelligence but almost no physical strength in the Classroom of the Supreme Power.

I just want to be different, no one can guess what I want to do, the more mysterious the more powerful.

- Description from novelbuddy