They are similar because they both talk about how lives from the past affect lives now. In "See You in My 19th Life," the main character remembers her old lives and tries to fix something important from her 18th life. This story talks about love, fate, and how the past affects the present. "Moon in the Day" likely has similar ideas, where the story shows how what happened in the past changes how characters act and feel now, mixing love, drama, and make-believe parts.

They both are Korean dramas that mix fantasy with romance and adventure. In both shows, the stories are about magical beings and their interactions with humans. They include elements of ancient Korean magic and folklore, but set in a way that feels new and exciting. Both dramas also have complex characters who go through a lot of changes and face big challenges, which makes the stories really interesting. If you like shows with a mix of magic, love, and action, you would probably enjoy both of these series.

They both use old Korean stories and legends in a modern way. In both TV shows, the main characters are magical beings from Korean myths who are trying to live in the modern world. These shows mix fantasy, love stories, and drama, making them really interesting for people who like stories about magic and romance. They also talk about things like fate, past lives, and how the world of humans and the world of magical creatures are connected, which adds a lot of depth to the stories. This makes both shows a good choice for viewers who enjoy new takes on old myths.