Mateo Doh is an alien who landed on Earth in 1609 during the Joseon Dynasty. He saves a girl from falling off a cliff and misses his return trip to his home planet and is stranded on Earth for the next four centuries

A very cold and distant being, he loved a girl who lived during the Joseon Dynasty for liking him as his true self, an alien. After the girl dies from saving him, he waits to return home. Living a lonely and isolated life for centuries