When the hit KBS drama I'm Sorry, I Love You aired in 2004, it achieved high TV ratings, earned critical acclaim, and rapidly became one of the flagbearers of the Korean Wave. The tragic love story of Mu Hyeok (played by So Ji Sub of What Happened in Bali) and Eun Chae (played by Yim Soo Jung of Lump Sugar and I'm a Cyborg, But That's OK) turned its leads into stars and drew a massive fanbase across Asia. Two years later, G&G Entertainment released a 35-minute animated adaptation of the drama, Between of One Year, which featured highlights from the series along with new scenes focusing on the final moments of Eun Chae and Mu Hyeok's relationship. The script was supervised by Lee Kyung Hee, the writer of the original live-action drama.