A girl who was sent to live with relatives after she was born spent her elementary, middle and high school life in an ordinary way. She is a very good-natured, simple and kind-hearted person. Although she does not say how good her life is, she has not encountered any setbacks, so she always feels that she is lucky and that her life is happy. Until she started college, her life didn't seem to be so smooth. After experiencing several relationships, she began to doubt herself, why she was a good person and treated every boyfriend with sincerity, but why she couldn't get sincerity in return and was always hurt mercilessly.