Good Morning, Mister Dragon! (WN) - Chapter 2769

Due to an unexpected turn of events, Xia Fei consumed a Super Gene Optimization Fluid that bore no brand, expiry date, instructions or stated its place of origin.
Our story begins here…

Leon and his father, Artorias, are the last remaining scions of a once powerful and illustrious family of lightning mages. After barely surviving an attack that destroyed their home fifteen years ago, they now live in the dangerous Northern Vales, a desolate wilderness far away from civilization. But those who want them dead are strong, patient, and relentless, and it is only a matter of time before they find the two they seek...

In her previous life, she wrongly loved a scumbag, but was killed by him. Once reborn, she vowed to let him be forever.

On the day of the wedding, the director got married by mistake as soon as she got out of the sedan chair, but she didn’t want to leave the wolf’s den and enter the tiger’s den again.

“If you enter this king’s door, you will belong to this king.” He swore domineeringly, declaring his ownership of her.

“Concubine Ai, this king has no children yet, so the important task of inheriting the lineage can be left to you.” She bet on her innocence, he helped her to avenge her, and each got the good deal they needed, but in the end, it turned out to be a fake.

Do, make it real?

- Description from novelbuddy

The strongest Hero in history, Nakamoto Keisuke.

He was summoned to another world in the spring at the age of fifteen years old, and when he successfully defeated The Demon King, he was already thirty-two years old. He had finished his role in another world and returned to Japan, but the reality that had been waiting for him was, “Middle school graduate with seventeen years of blank period” label. He couldn’t find a decent job and had no choice but to spend his days working part-time.

Before such a Nakamoto, a beautiful girl who self-proclaimed had come to return the favor, appeared. “I’m the reward for Hero who had defeated Demon King”, said Angelica, a girl who came from another world that persistently tempted Nakamoto to make her his wife. Together with a high school girl who looks like Elsa, his beloved girl that he lost in another world, Nakamoto with his cheats skills got caught in a harem life.