29 years old , Baek Dohee who feels hopeless and skeptical about her life , dreamed of escaping from a frustrated heart , met Jun Won in place of her friend , Nuri. Due to an unknown attraction they end up having a one night stand . Dohee passes days without meeting Joonwon inorder to forget that day. Dohee reunites with Joonwon , who has taken the position of team leader. However, Joonwon who shouldn't be able to remember "that day" , clearly remembers Dohee and everything that happened that night. No matter how hard she tries to push him away , she's still dragged towards him who approaches her recklessly. Can the two men and women who became emotional hedgehogs for their own reasons , will be able to break down the wall and be happy together? PS : Here "emotional hedgehog" is used as a metaphor for the dilemma humans are faced with in their intimate relationships with others.