Original name: 블루버스데이
Release date: July 23, 2021
Series
Average time: 24 minutes
Genres: Sci-Fi & Fantasy, Drama, Mystery
Synopsis: The series tells the story of Oh Ha-rin, who travels to the past through mysterious photos left by her first love, Ji Seo-jun. Since they were eight years old, they had been close friends, but he died by suicide on her birthday ten years ago.