The Thirteen Sons Guard the Earth

It wasn't until all the remains of the thirteen sons of the Dragon Kingdom were unearthed from Mars that the whole world finally accepted the truth of the matter. It turns out that Daxia protects far more than just the land of Dragon Kingdom. There were really thirteen heroes of the Dragon Kingdom who died fighting in the universe to protect Blue Star. No one knows how tragic that battle was. It wasn't until thirty years later that humans landed on Mars for the first time, and found a familiar red flag in an unexplored area, as well as the wreckage of a dilapidated battleship, a huge steel mecha, and a giant head buried in the sand. At that moment, Longguo scientists were dumbfounded.