I Byeol-e Pil-yohan

Both animes portray a determined protagonist who has some kind of connection to something in the sky, or beyond it. They fall in love and go through experiences that are different from what we usually see in romance animes. I don't think I Byeil-e has an anime that is even remotely similar, I've never seen anything like it, but I believe that those who like it could really enjoy the films from CoMix Wave Films. The main couple's journey has a similar emotion, at least that's what I felt watching it. 

Both are stunningly beautiful series with a similar style, providing snapshots of ordinary people’s lives and showing how life can be beautiful, whether through connection, memories, unfulfilled love, or quiet moments of reflection.  

Both animes have beautiful artwork and centers around the same plot of lovers separated by an unreachable distance. The characters endure pain quietly as they pray that one day, they will reunite with their loved ones 

Both stories feature a couple who are separated by long distance: earth and space. The anime focuses on the emotional pain of waiting for one another while hoping that one day, they will reunite and be together again.