Gimai Seikatsu - Days With My Step Sister - Chapter 30 - 5

Outer Sect Disciple Chen Yu, assimilates within his body a fiendgod heart.

The heart, is the backbone of life, the human body’s fatal vital point. And it can be said that Chen Yu’s heart is actually his strongest defense point, and permits him to overtake demonic beasts, or divine beasts unlimited potential.

Henceforth, he steps onto the stage and surges forth on a magnificent scale, in a heart-rending mysterious journey.

Talented as a cloud, an unparalleled supreme talent.

10,000 races glorious, cross boundary battles.

Only my heart, eternal!

- Description from Novelupdates

In the world of dragons and snakes, the talented but congenitally sick martial arts master was reborn as the sole heir of the 19th-century Canadian manor owner. He thought he would make money by practicing boxing, but he took advantage of the industrial revolution to become a giant of the times. The opened template.

In the end, the original owner was a hopelessly sick and consumptive ghost! I am still a bastard having an affair with a gardener…

Wait, what’s up with the claw?

James Howlett looked at the bone claws protruding from between his fingers, and became more and more worried about his future.

- Description from novelbuddy

He’s the dream guy of women world wide, the CEO of a formidable mega-corporation. But, he’s absolutely powerless against her, resorting to all kinds of methods to force her into a marriage, tying her to his side with a certficiate.