On October 27, the two were revealed to have been cast as the leads. The drama will start airing through Naver TV Cast on December 5 as well as China's app, Miaopai. The drama centers on Mizo, an immortal woman who is 1,000 years old, and a male musician, Jeon Woo, who has an unpredictable personality and appears before her. She gives love advice to people because of her 1,000 years of experience but gets to experience sincere love after meeting Jeon Woo. Meanwhile, Jeon Woo is part of hip hop crew, Krunk Soul, and yearns for his first love whom he met fifteen years ago.
Kim Hee Jung plays Yeon Ji, a member of Krunk Soul who has a one-sided crush on Jeon Woo. Yet another member of the group is Hyung Sik, who has quirky charms and will be played by WINNER group mate Kim Jin Woo. Jang Ki Yong plays Jason, who was a neighborhood friend of Mizo for a long time.
The production crew revealed that they had their script reading back on October 7 and started official filming on October 11. It'll air fifteen 10-minute episodes.