Kyung-min lives alone in a one-room apartment. One day, she finds traces of a stranger breaking into her room and soon a mysterious murder case begins to unravel.

Jun-Seo (Lee Chun-Hee) and Mi-Yeon (Han Ji-Hye) have been dating for a long time. Jun-Seo grows tired of his girlfriend's unfailing love, and volunteers to do research work in Antartica….

So-wol, unable to move on from the accident which killed her boyfriend, ends up living in on Jeju Island, site of the tragedy. Three years later, old friend Cheol visits.