The protagonist's slogan in Guardian of the Earth is: Magic Hammer Change! ! ! I remember that I could turn the small combined robot into reality, and I also found some companions to drive it to deal with the enemy. It's funny, but I can't remember whether it's Japanese animation or Korean animation. It is Korean animation. The protagonist is a little boy with an animal. At first, the boy had a magic hammer that could make things bigger and smaller. Later, the magic hammer fell off, and a flying machine like a Rubik's cube appeared, which was driven by a little boy.