A romantic comedy drama about an alien man who landed on Earth 400 years ago during the 17th-century Joseon Dynasty period, falling in love with a modern day actress.Do Min Joon (Kim Soo Hyun) is an alien who possesses a near perfect appearance and enhanced physical abilities involving his vision, hearing and speed. His character also happens to be a university professor and He looks 20. Although he holds a cynical view to human beings, but he gets entangled in a sweet love story with actress Chun Song Yi (Jeon Ji Hyun).