Second-year chemistry students weren't supposed to deal with death. But when an entire family is found dead under unexplainable circumstances-a mother, her daughter, and a young boy-everything changes. Their bodies show no signs of violence, only the effects of a strange, unidentified liquid that no one has ever seen before. The father had already passed away years ago. The eldest son is missing without a trace. And everyone else? Still here. Watching. Hiding something. Relatives, neighbors, friends-each of them connected, each of them a possible piece of the truth. When their professor secretly assigns Chaeryeong and Taehyun to analyze the substance, they bring Ryujin and Beomgyu into an investigation that quickly spirals beyond control. What begins as a scientific study turns into something far more dangerous-one that forces them to question not only the case, but the people around them... and each other. Because some reactions aren't just chemical. They're human. And once they begin, there's no stopping what they might become.

The Abandoned school, few students will explore it, read to find our more what will happen!