Kim Yongsun, a barista in Seoul, has led a rather uneventful life for the past 28 years. Her existence has come to the point where it’s simply just a routine, wake up, go to work, go to sleep, repeat. Really the only thing worth noting in her life was a series of dreams she had when she was younger, however, these dreams have long since faded away. Until, April 17, 2019 hits the corner and the dreams begin flooding back, this time more vivid than ever. Each one seems to have two common factors, a small multi-colored butterfly, and a woman. Somehow, these dreams become increasingly familiar, as if they were memories from hundreds of years ago. Although, that couldn’t possibly be true. At least, that’s what Yongsun has managed to convince herself of.