Sui and Tang Dynasties: Yang Guang Was Shocked at the Beginning

When a very ordinary modern person came to the Sui and Tang Dynasties, he was very excited because he felt that he was just like the protagonists in those pornographic books. If he survived a catastrophe, he would be lucky. He could pick up girls at will, fool the ancients with a little historical knowledge, and have sex at will. However, after living in this era for a period of time, he I discovered that this world is not as beautiful as imagined. Beauty is not born for you, and the earth does not rotate for you. If you want to survive, you have to integrate into it. If you want to change the times, then you must first let the times change you. If you want to live, then... First you must not die.