I Thought You Were My Best Friend, but You Want to Be My Sister-in-Law

Xia Wan and Xing Rou have been best friends since childhood. They are the same age, and both are twenty-two this year. They have been by each other's side all along, sharing everything and growing as close as sisters. Years together have given them a bond no one else could replace. A glance or a gesture is all it takes for them to understand what the other is thinking. They share their joys and comfort each other through hard times, each the warmest support in the other's life. I thought you were my best friend, but you want to be my sister-in-law? I thought you were my best friend, but don't you want to be my sister-in-law too?