Earth

"I miss the planet of Earth. I miss my old village. Gyeongyeong is home to me. If I remember this planet forever, it would soon recover for as long as it exists after the big war changed it forever."

--Su Ji-Hoon, Epilogue

Earth is the third planet from the Sun and the only object in the Universe known to harbor life. According to radiometric dating and other sources of evidence, Earth formed over 4 billion years ago.