Based on the webcomic “Naemsaereul Boneun Sonyeo” by Man Chwi which was first published from 2013-July-23 via “cartoon.media.olleh.com“.

3 years ago, Choi Moo Gak (Yoochun) lost his younger sister in the “BarCode Murder Case”. Since then he has become cold and insensible. Meanwhile, Oh Cho Rim (Shin Se kyung) miraculously survived in the same incident. Since then she had an amnesia, but also gained the ability to see smells.