When hit KBS drama I'm Sorry, I Love You aired in 2004, it recorded high TV ratings, won the acclaim of critics, and quickly became one of the flagbearers of the Korean Wave. The tragic love story of Mu Hyeok (So Ji Sub of What Happened in Bali) and Eun Chae (Yim Soo Jung of Lump Sugar and I'm a Cyborg, But That's OK) made stars out of its leads and attracted an enormous fanbase throughout Asia. Two years later, G&G Entertainment released a 35-minute animated version of the drama, Between of One Year, consisting of highlights from the drama and new scenes dealing with the final moments of Eun Chae and Mu Hyeok's relationship. The script was supervised by the writer of the original live-action drama, Lee Kyung Hee.

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