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, he one day meets Cheon Song-yi, a girl who, at her young age, looked exactly like the one he cared for 400 years ago and whom he once saved.
Min-joon is a curious alien that ventured to Earth during the Joseon Dynasty. Upon landing he almost kills a girl who had just recently widowed. He uses his powers to save her and she later proceeds to feed and clothe him in return. The girl's mother and father-in-law proceed to kill her in order to claim her life insurance. Min-joon and the girl hide at her parents house living peacefully and Min-joon's arrival causes a political scandal because the stars were greatly changed and the villagers were worried. The local lord decides to purge the girl and she dies, along with her family, to save Min-joon. Min-joon then vows never to love a person again and decides to keep only a couple of friends to help him conceal his identity. He spends hundreds of years waiting for a comet to return him home.