In a confused snow, Mu Xiaoxi and her brother came to an alien planet. In a confused period of time, Xi'er's brother disappeared! Why is my brother missing? Where did my brother go? What did my brother do? Xi'er carries her wish and follows five angels with young faces to search for her brother across the planet. A runaway, a moment of laughter, a tear, a lie. What is Xi'er's fate? This is a Cha Cha with a tearful smile!