After 19 years of brutal training in the mountains, Nathan returns to the city, only to start over as an ordinary security guard because he has no degree or work experience. Everyone underestimates him—until his hidden powers leave them speechless. His biggest shock comes when he discovers that his boss, Claire, is the childhood sweetheart he once promised to marry. As their buried past slowly comes to light, Nathan must find his lost family and rekindle the unfinished promise with the woman fate brought back to him.
