I don't believe in aliens' existence because I've never seen any UFOs or met someone who is such a stranger. But I met Martian only once in a dream when I was a kid. I don't know what a real Martian looks like, but people in Japan tend to think they look like an octopus; they have a red body, eight legs, and no hands. I don't remember what happened in that dream. They came to my house's yard, and I felt slightly scared. Then I woke up and realized it was a dream, but I was worried if they had put something to track me in my head for a while.