Soojin is a single mother raising her son, Jihu, on her own. One day, Mihyun, the owner of the banchan (side dish) shop where Soojin works, learns that Soojin is a single mother through Jihu and becomes a new member of the church Soojin attends. Mihyun's numerous acts of consideration towards Soojin gradually turn into obsession. The moment Mihyun completely infiltrates Soojin's life, strange things begin to happen to Soojin.