Looking for her long-lost twin sister, a woman from Hong Kong bikes around Taiwan, joined by three complete strangers, one from Hong Kong, one from Taiwan, one from China, each biking around the island for his/her own reasons.
Born into a wealthy family, Xiao-wei lives a carefree life with his loving mother's care. He enjoys reading picture books written by his favorite author Kauff, especially those works about mermaids. One day, he accidentally takes the wrong bus, arrives at the seacoast and meets a mermaid, Blue. He believes Blue is the embodiment of the character in those picture books. Since then, Xiao-wei's "normal life," has become not "normal."
Xiaogin transferred to the third school during his fifth year at high school. During the winter vacation, his grandparents tricked him into returning to the hotel which was founded by his parents. Xiaogin’s classmates Little Princess and Lu Qun tagged along uninvited to escape being bullied at school. While the three boys were temporarily staying at Xiaogin’s family hotel, they quickly found out that the hotel was in terrible shape and was also haunted. Xiaogin and his friends have developed an extremely close friendship while they are trying to step closer to the truth. Will they find out the secret that hides underneath the steaming hot springs?