I want to know That 1 human on earth

If you mean "Who was the first human on Earth?", science does not identify one particular individual as the first human.

Human evolution happened gradually over a very long period. Modern humans, Homo sapiens, evolved from earlier hominin populations through a gradual evolutionary process. Therefore, there was no single day when one particular individual suddenly became the "first human."

If you mean the oldest known human fossil, the first person to live on Earth, or the first human according to religious traditions, please specify which one you mean, because these are different questions.