According to Taiwanese media reports, in the MV of "The Sea That Cannot Be Returned", the director used "skating" to present the concept of the little mermaid leaving the sea with legs and desperately seeking love. Although Cai Peixuan learned to skate in Canada when she was a child, the MV challenged four-wheeled skates. She spent nearly a month in intensive training beforehand. During the process, she broke her hands and feet. She didn't care and said, "Because of my favorite sport. It’s just skating, and it feels like flying freely.” When filming started, the director specially invited the photographer who had won the international inline skating championship. She was wearing inline skating and followed the shooting all the time. She looked at the photographer’s superb inline skating. Stunt, she said: "I really want to worship him as a teacher!" In addition to skating beautifully,
also staged a scene of slipping into a fall. At first, she couldn't catch the timing and expression of the fall, so she repeated it again and again. I fell no less than 10 times, and fell to my legs in order to be in place! In addition, the director originally wanted her to shoot in heavy rain, but because there was no rain, she switched to a shower scene. Unexpectedly, the water temperature was not properly controlled at first, and the hot water directly attacked her, until the director called a card, she jumped away Said: "The water is hot!" The professionalism makes the staff feel distressed: "It's too hot to say, what should I do if I get burned!"