After an extended hospital stay, sisters Su Mi and Su Yeon return home, only to find things have changed since their mother's death. Their stepmother, Eun Joo, welcomes them, but tensions rise. Su Mi, the stronger and more outspoken sister, protects the timid Su Yeon from their stepmother's cruelty. As strange occurrences unfold in their home, the sisters sense something sinister at play. One night, Su Yeon feels an unseen presence in
