This was because human emotions were very complicated, including sympathy, emotion, sadness, joy, and so on. When we see something moving, our brains will receive this information and produce an emotional response. These emotions may make us cry because it's a natural physiological reaction that helps us express our emotions and transmit information. Sometimes we are moved by fictional plots even if they are not real. This is because our emotions and brains process things differently from when we read about real events. When we read fictional stories, our brains will turn it into an emotional experience and make us feel as if we were there. This emotional experience may make us cry because it is an emotional expression similar to a real event. In short, crying is a natural physiological reaction that helps us express our emotions and transmit information. Whether we see real events or fictional plots, our emotions and brain processes make us believe that they are real and produce physiological reactions such as tears.