What's the biggest difference you're likely to see before and after marriage?

Some people say that marriage is like a besieged city. People outside the city want to go in to find out what’s going on, but everyone in the city wants to get out of the city. Some people say that marriage is a watershed moment that changes a person beyond recognition. Some people are very afraid that after getting married, they will change from being noble, free, and considerate to being vulgar, tacky, and unreasonable, wandering around all day for money, rice, oil, salt, dolls, and children… Then if it is you, you may behave like this before and after marriage. What’s the biggest difference?