In a future technology city in the 21st century, a top mercenary king accidentally triggered an ancient portal during a mission and traveled to a war-torn period in ancient times. He discovered that he not only possessed combat skills beyond this era, but also carried some gadgets from the future technology. In order to survive and find a way back to modern times, he had to use his skills and knowledge to become a mercenary king again in the ancient world, while gradually solving the mystery of time travel.
