Such a Crazy Ending

The main character, Cha Ji-Ho, is an elite student who grew up with a mother who is passionate about education and never missed the top spot in the entire school. Even though all of her life plans went according to her mother's wishes, there was a boy she secretly had a crush on, and his name was Yu-Chan. One day, Ji-Ho switches his notebook with Yu-Chan's and discovers his great secret... A life-scam marriage romance between a woman who realized that her life was short and a man who believed that she could save someone with her own abilities. (Source: Naver, translated)