Starry sea of stars is endless

Hong Xixiu, who was reborn in the interstellar era, originally wanted to just wait until death and spend the three hundred years of his life well until his death.
As a result, he survived all the way and became a legend in his life.
There are mechas, battleships, hot blood, and maybe a little bit of other blood?
Check it out: The protagonist is a couple who were only married in name for a few years in their previous life, but have no real relationship.
Because marriage is a match between the central brain and the brain, there is no chance of Xiao San cheating on her or having a romantic relationship!