A high school boy lives with his stepsister. He was brought up by this girl who is not much older than himself. With the growth of age, boys have feelings for girls that transcend the relationship between brother and sister. The girl hasn't noticed that all aspects of life are still taking care of the boy. One day, when the boy was in English class, he secretly composed music and wrote a score below. The name of this song is "You are my woman". Some bad students sitting around the boy grabbed his grades in class and made fun of him, which made him lose face in front of the whole class. At noon, my sister came to deliver rice to the boy. The scene of them eating together was once again seen by those boring male students. They ran to provoke again, and the result was driven away by the provocative girl. The boy regards his sister as his guardian angel. One day, the boy came to his sister's work unit and found that the girl he secretly loved was not so perfect. In order to make a living, the girl works as a waiter, and the boy is angry and annoyed, hating that he has no ability to protect his sister. He began to deliberately avoid girls. Unexpectedly, the boy was teased by bad students at school and was injured. When the boy was most helpless, it was the girl who gave him the comfort he needed most, and the two made up. One day, the girl came home and found the boy's music score. Only then did she know that the boy he regarded as his younger brother had always loved himself. So the girl gradually changed her attitude towards the boy. Gradually, the boy also believed that the girl could live an honest and clean life and sent her to work. But the girl was molested by the guests, and the boy stepped forward to save the girl. The seriously injured boy finally escaped with the girl. The girl sent the boy to the hospital. After several hardships, the girl finally felt the love for the boy, and the two finally embraced each other.