MTL - The Law of the Silent Gentleman - Chapter 51 moon night

A human from Earth is thrust into the [Hunter x Hunter] world, becoming the Zoldyck family’s defiant, red-eyed prodigy. They call me a genius and the rightful heir, but I say that’s Killua’s burden to bear.Armed with crimson eyes, and a subtle yet powerful system, I’ll rewrite destiny, upend the world, and embrace the chaos with a wicked grin.

His fiancée, whom he had never met, had just broken off their engagement. He's then betrayed by his girlfriend and schemed against by her lover.His mother's legacy awakens him. No longer content with mediocrity, he transforms into a dragon overnight.

The figure of the Armada seems to be still riding the wind and waves in the Atlantic Ocean, and the gold of South America still seems to flow in continuously. As Alfonso from the Bourbon family returns to the Royal Palace of Madrid where he was born, the story begins here…

- Description from novelbuddy

She was the heiress of the influential military and political Shen family. She possessed an exceptional face and a cool demeanor. Although she was the apple of her family's eye, she was disliked by her birth mother.He was the only heir to the immensely wealthy and powerful Fu family. Powerful, arrogant, and cold, he was the captain of a stealth corps and the youngest commander.To fulfill her grandmother's final wish, they got married in a flash. Initially, she regarded the marriage as a mere contract, but she did not expect to elicit his utmost admiration.