Mary meets a death metal group's vocalist and falls in love with him. Although he is very handsome his personality is not that good. Will those two finally become a couple or will Mary's logic, that it's telling her to not get involved with him, prevails?

Original Webcomic: http://cartoon.media.daum.net/series/list/mary?t__nil_news=img&nil_id=10

This was adapted into a K-Drama under the same name in November 2010.