In the distant past, the survivors of the last round of human civilization built the "Tianmen System" - a network of stargates spanning the galaxy and connecting forty-two worlds. The core of the Tianmen system is "Honghua authentication": it is only open to specific human DNA sequences. People who carry this gene will, under certain conditions, experience "ironization" - a physical phase change in which the body transforms into light. Such people are called **Honghua people**.
Every Honghua person has a **Crimson Transformation Seal** in his body. It is both a key and a signature. Four thousand and seven hundred years ago, a catastrophe interrupted all channels of the Tianmen system. The last gatekeeper left the bronze gate at the foot of Kunlun Mountain, encoded the coordinates of the Tianmen into the "Book of Mountains and Seas", and waited for the descendants of the Honghua Man to return.
Today, Gao Xing - a physics researcher who carries a complete Honghua bloodline in his body - is involved in a secret that spans the history of human civilization by a bronze door that has been awakened for thousands of years 800 meters underground.
