A Reincarnated Mage's Tower Dungeon Management - Volume 6, Chapter 9 – Royal Doggy

However, he did not know that he was not raising just a harmless pet, but a biological weapon secretly made by the government… a real monster.

As a former librarian, Rand felt that he had been living an ordinary life, the one that he had reclaimed unconsciously every single day.

Recently, he has been a little upset because the pet fish he accidently brought home to raised seems to have undergo some strange changes

Well, it turned into a merman.

- Description from Novelupdates

The Yanhuang Ancient Domain, vast without end, gave birth to many Celestials and Demons of antiquity tore Heaven and Earth apart and surpassed the control of the 3 Realms and 5 Elements over the endless years it has existed. Numerous Gods, more than ten thousand races, and humans born with a God class body have also come out from the Domain, traveling through the nether, warping Yin and Yang, omnipotent.

Ni Yang, a modern businesswoman, is reborn in her seventeenth year.

The year is 1983.

In an era that favors boys over girls, Ni Yang revises her tragic fate from her previous life, skirmishes in the mall, and overcomes the most challenging obstacles, achieving success step by step – a radiant progress.

Observe how Ni Yang, with her petite but capable hands, overturns her fate from an ordinary rural girl to become the richest woman of her time.

However, in the process of building her wealth, Ni Yang inadvertently attracts the attention of a mysterious magnate.

So, the aloof and mysterious magnate in the eyes of outsiders transforms into a devoted husband, becoming an outright ‘wife slave’.

From then on, ‘wife is Heaven’, ‘serving wife is duty’.

This story is also known as “The Years When the Female Lead Conquered”.