After 10 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” start to tear the household apart. Is it Jin-Sung or something far more sinister?