All of Us Are Dead

A virus outbreak occurs at Hyosan High School. The infected quickly turn into human eating zombies. Students at the high school must now fight for their lives, while they look for a way out. Nam On-Jo (Park Ji-Hu) & Lee Cheong-San (Yoon Chan-Young) have been friends since they were children. They are two of the students trapped in a classroom and surrounded by flesh eating zombies. Meanwhile, the Korean military work to isolate the outbreak and protect the country from an even larger outbreak. Source: AsianWiki