Alex (Vincent Perez) is about to get married. In his mind, going to bed means the end of love. This is because when he was a child, he saw his mother constantly changing her sexual partners. When he saw Fangfang (Sophie Marceau) dancing, the flame of true love ignited in his heart. Alex decided that he would pursue Fangfang, but not involve lust. Fangfang also fell in love with Alex, but Alex and her were completely spiritual love, which made Fangfang very distressed. In order to get close to Fangfang, Alex lived next door to her room and installed a one-way glass to observe Fangfang's daily life. Watching her put on dance clothes, lift up her dance steps, and make all kinds of ghostly expressions, he did not have the courage to break the boundary between the two. This glass became a wall in Alex's heart. How long will it take before lovers can finally get married? Fangfang finally discovered Alex's secret, but can Alex dispel his knot?