To prove herself worthy of joining 'Animal Army' a radical activist group led by the fearless Nasha, Mirthe secretly films the horrors of a local pig farm. Her footage earns her a mission to free the pigs, but when Mirthe and the group return at night, they find the cages empty: the pigs already slaughtered. Enraged, Nasha shifts her focus to revenge, targeting and torturing the farmer's children. Mirthe objects, but chaos erupts when the farmer returns, determined to protect his family as he hunts down the activists. The farm becomes a bloody battleground while Mirthe is trapped between Nasha's vengeance and the farmer's fury. Mirthe must get her hands bloody if she wants to get out alive.

年仅25岁的李壬曜（曾敬骅 饰）自首并坦承自己就是媒体口中冷血杀害昔日高中同窗的“暴雨杀人魔”。入狱后，他首度答应接受纪录片企划周品瑜（江齐 饰）的采访，没想到她却因此在梦里与李壬曜陷入暧昧缠绵，并逐渐被一名身穿高中制服的神秘少女（李沐 饰）纠缠。梦境与现实的界线逐渐模糊，埋藏在校园岁月里的爱与恨、罪与救赎，也一步步浮现眼前。