Beom-sik Seo

Seung-Joo is a CEO and Jung-Taek is a detective. They have known each other for 20 years. One night, Seung-Joo loses his cellphone to four male high-school students and Jung-Taek loses his gun to the same high-school students. The cellphone and gun are very valuable to Seung-Joo and Jung-Taek. The two men must get their items back from the high school students.

A group of chat room buddies decide to meet together in reality on the beach for some fun in the sun. However, their vacation transforms into a nightmare as each person except Nam-kyeong (Kim Hyun Jung) is murdered by the mysterious person 'Sandmanzz' with gruesome deaths. (imdb)