"You’re its prey the moment you touch it." 

One day, a terrible virus variant attacks Seoul! 

Yeon-woo is on a school trip to Seoul, and is excited thinking that he can finally get along with his one classmate, So-yeon, whom he has a crush on.

However, during this time, unidentified cells appeared in front of Yeon-woo’s class, who were sightseeing in Seoul. The mutant cells manifestation quickly turns Yeon-woo and his classmates’ school trip into hell as anyone who comes into contact with the cells will become a hideous monster that wants to consume anything with flesh..! 

Will Yeon-woo be able to leave Seoul safely?

Chuyến đi tham quan thành phố Seoul của Yeon-woo cùng các bạn học bất ngờ biến thành thảm họa khi một loại virus đột biến xuất hiện. Những tế bào lạ mặt biến bất kỳ ai chạm vào chúng thành những con quái vật khát máu, đẩy nhóm học sinh vào cuộc chiến sinh tử.

One Day, Suddenly, Seoul Is

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