Nine-year-old Dojin often spends time alone at home. One day he heads to the backyard to make an anthill and witnesses a murder. He brings home the bloodied brick used as murder weapon.

Moon-jung is a caregiver who has a son in middle school. After getting divorced, she can't bear to bring him to her house, a plastic greenhouse she has converted into a home. She strives to raise the necessary funds to move into a real home for her and her son.