Due to the release of a new product, Jae-won stays in the office by herself till late at night when her longtime stalker barges into the office, trying to attack her. Later, Jae-won finds out the stalker’s identity. Nam Tae-ju, an insurance investigator, tells Jae-won that they’re suspecting Jae-won’s stepfather for her mother’s death. Meanwhile, Jae-won sees a suspicious message on her husband’s phone, only to find out later that he is cheating on her.