After young concert pianist Siwan loses part of his hand in a tragic accident, his family falls into a serious crisis. Following a strange prediction by a psychic, he departs for Prague with his supportive father Minkyu and good-humored uncle Jinwoo. They must find a mysterious white cat, who allegedly holds the key to Siwan's future. Once reaching the Czech capital, they're drawn into an ancient struggle between two groups of mystical shapeshifters!