The beautiful CEO falls in love with me

Once, he was a spectacular man.
Once, he was a heroic figure standing tall.
Once, he was the heir to the world's most secretive family.
When it all ended, the hero lost his memory and indulged in the city...
Now, he becomes a contractual slave in the hands of a female CEO.
Now, he leads a group of underlings down a dark path.
As the hero awakens and the horns of battle sound, a mysterious veil is lifted, and he is destined to be a figure that makes the Earth tremble.