Both Yonder and Circle discuss the idea of storing, replaying, replanting and reliving memories
Though circle has alien technology to help them with more action and angst, the idea of reusing memories, will you relive in it, delete it or move on?
Yonder kdrama also has the same concept of meeting ur beloved ones on other side of the world. I.e meeting those who once existed or are not able to interact with them in real world. It seems this theory is same with this drama based on the given summary of this film.