Famous Royal Concubine

In his previous life, Shu He was forced to jump into the river by his scumbag ex-boyfriend. When he opened his eyes, he found that he had actually traveled through time; Goodbye, my best ex, I am so friendly and have modern knowledge, I don't believe I can't hold back your wild horse! Hey, wait, who is the handsome guy who keeps appearing in my dreams? Why do these two people turn swords on each other whenever they disagree? What is the token that everyone is grabbing for? Oh my god, who is this possessed by? Forget it, it's better for me to escape first! Want to slip away? It's not that easy!