Why Am I the Villain in Ultraman?

The destruction of the root causes the body, who is it? Is it a giant angel emitting holy light behind the wormhole, or a dark thunderstorm in the crack? The earth monster sleeping underground, the conspirators who covet the earth, the internal struggle of mankind, three giants with different struggles. Traveling through time and space and across the world, why will Ultraman definitely save mankind? In fact, what Ultraman saves is not human beings, but his former self, so what if he risks his own life?