Se-hee is a shop attendant who lives alone with her sister, the high school student Jung-mi, due to their mother's death and their father's decision to work in the United States. Due to a misunderstanding, she is estranged from her boyfriend, the Information technology college student Joon-hyuk, who tries to make amends by asking Jung-mi to convince Se-hee for a reconciliation. In exchange, Jung-mi, who secretly earns money for both her and Se-hee's tuition by uploading viral videos, wants him to download a blocked video supposedly cursed to kill its viewers.