This is a 100% pre-produced drama that is based on webtoon “계룡선녀전/Tale of Gyeryong Fairy” by “돌배 / Dol Bae” which was first published from 2017-March-1 via “comic.naver.com/webtoon/“.
Sun Ok Nam was a fairy in the Goryeo period. While she took a bath at a waterfall on Gyeryong Mountain, a woodcutter took her fairy clothes and hid them. Because of this, Sun Ok-Nam could not go back to Heaven. She then married the woodcutter and they had two children together. After her husband died from falling off of a cliff, Sun Ok-Nam tried to find her fairy clothes, but she still could not locate it. Needing her fairy clothes, she decides to wait for husband to be reincarnated.
Now in the present day, she makes coffee at a cafe on Gyeryong Mountain and waits for her reincarnated husband. Finally, after 699 years, she gets a feeling that one of the two men visiting her cafe from Seoul is her reincarnated husband. Sun Ok-Nam is not sure which one of the two men is her husband. She deicides to follow them to Seoul to find out.