Song Dynasty: Sign in at the Beginning to Be the Son-In-Law

[Easy][System][Sign in] Zhao Qingyu was transported to the Song Dynasty by something called the sign-in system, and he actually became a son-in-law! He said: I am so strong and strong, how could a generation of acting doctors fall like this! Hey... Actually, if my wife is good-looking... It's not impossible. See how I experience the time-travel life that everyone else has. Doing business, engaging in politics, fighting, visiting brothels... What? You ask me if I understand history? Do you know self-defense? Can you still survive after traveling through time? Sorry, please set up the sign-in system for me, I'm cheating!