After ten years of marriage, Do-il (Kim Jin-geun) and Mi-sook (Shim Hye-jin) live a seemingly happy and secure life together. Unable to conceive, they decide to adopt Jin-sung (Moon woo-bin), a young boy that Mi-sook is drawn to after seeing his Munch-like paintings. Quiet and introverted, Jin-sung spends most of his time playing underneath the Acacia tree in their backyard, away from the family. When Mi-sook becomes miraculously pregnant, he becomes even more detached. As the once-dead Acacia tree in the backyard begins to bloom, terrible accidents begin to tear the household apart. Is it Jin-sung, or something far more sinister?