Salvation? I Will Execute My Best Friend First

I traveled to the interstellar colonial era at the end of the Tang Dynasty. I originally wanted to keep a low profile and live my life, but unexpectedly I became a life-and-death friend with the future emperor Li Chen. In the bloody battle to win the rightful son, I narrowly escaped death to protect him, but after he ascended the throne, he wanted to marry my beloved as his queen for the sake of power. In anger, I activated the interstellar weapon system and planned to directly wipe out Chang'an. But just before firing, I received a warning from three hundred years in the future: "You are not killing a foolish king, you are the only hope to save China -" What shocked me even more was that the signature of the sender was Li Chen. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.