Z: LAST DAY AT SCHOOL

Kim Eun Jin is a teenager who lives her school life as usual-at least as normal as it can be in a world that was once in chaos due to a zombie outbreak. She lives with her mother's younger brother after her mother's tragic accident. At school, she befriends Min Jun and Hyun Woo, two best friends who are always by her side through thick and thin.

However, behind her seemingly peaceful school life, Eun Jin holds a secret: she once learned to shoot from her father, who mysteriously disappeared before the outbreak. Unexpectedly, her father's disappearance is directly related to the cause of the disaster. Her father is not an evil scientist, but rather someone who tried to stop an experiment that eventually got out of control.

When a series of strange events begin to occur at the school-students disappearing, reports of people behaving strangely resurface-Eun Jin and her friends must face the reality that an old threat may be rising again. With the help of her teacher, who turns out to be a close friend of her parents, Eun Jin begins to dig deeper into the hidden conspiracy.

However, the deeper they investigate, the more dangers lurk. Will Eun Jin be able to find the truth behind the outbreak? Is her father still alive? And more importantly, can they survive when the horrors that were supposed to have passed begin to return?