The male protagonist's father eloped with his mistress on the day he was born, leaving him and his mother behind because his father was laughed at by other children since he was a child for being a child without a father. Because of this incident, his mother took him to another city when he was in the third grade of junior high school to escape these gossips. When they came to a new city, they didn't mention any information about their family just to protect the weak ones. And when the male protagonist entered high school, he met someone who saved his life. The heroine cured the male protagonist's heart disease that had been suppressed in his heart, giving him the first ray of sunshine from birth to now. The heroine's family is exactly the opposite of the hero's family. She has parents who love him and had a happy childhood. During these three years, the heroine has been saving the hero. Not only does the heroine accompany him alone, but he also has two other partners. After they graduated from high school, they made a five-year agreement to make themselves better during these five years, and they got engaged once the five years were up. In the end, they got married and gave birth to a girl, but this caused the heroine to get cancer. In the end, the hero raised his daughter alone.
Purpose: The heroine redeems the hero