Junrong, a university professor, has always advocated for sex without love, believing that marriage is merely an outdated and unnecessary institution. His friends arranged a date for him as a thank you for being a best man. On this date, he met Juanji, a sexy and open-minded lighting designer. During their first date, they chatted casually and ended up getting drunk. Neither of them could remember who suggested it, but they decided that renting a hotel room was cheaper than taking a taxi, leading to their first sexual encounter.
Juanji, with her open-minded attitude, didn't mind having a relationship with a man who only wanted romance and not marriage. A subtle relationship began to develop between the two: she married a doctor for financial security and used his money to support Junrong, even renting him an apartment which became their love nest. Juanji would come over on weekends, and they would decorate the new place together, go shopping, watch TV, and make love. Gradually, Junrong, who feared commitment, began to feel confused about their ambiguous relationship. Were they adulterous lovers or a happily married couple?