During Adam (Ashton Kutcher)'s growing up, Emma (Natalie Portman) always showed up from time to time, so the two can be considered friends. Once, when Adam visited his celebrity father, he found that his father had actually moved in with his ex-girlfriend, which Adam could not accept anyway. After suffering emotional trauma, Adam decided to find a random female friend to have sex and develop diarrhea and depression. After Adam woke up with a hangover, he found himself naked at Emma's house. After reaching an agreement to "only talk about sex and not love", the two began to meet from time to time. Over time, Adam found himself moved by the maverick girl beside him, but Emma expressed that she could not accept Adam's love, so they finally decided to end the relationship. However, after breaking up, the two realized that they were already used to each other...