The younger brother wonders. Why am I the only person whose blood type is A? Why do my eyes look different from other family members? He searches for the answer to his identity and concludes he is an alien. On his birthday, he plans to go to space. His older sister seems to support him but will be in his way. The director creatively addresses the confusion surrounding identity and conflicts, reviving the childhood imagination that can be a trivial fantasy. The film is heart-warming, with sincere and caring siblings' cheerful chit-chat. (JEONG Ji-hye)