Getting a Son-In-Law on Credit: Whose Family Should I Become a Son-In-Law?

Lin Yi was cheated on the day of their engagement, and accidentally inherited the credit knife from his grandfather Guigu, and became the head of Lin's credit knife sect. Before leaving, grandpa left nine letters of agreement, asking him to marry these nine beauties. From then on, Lin Yi turned into yin and yang, and settled the world across the city.