What is the story of Emperor Liu Xin and Dong Xian?

The story of Liu Xin and Dong Xian, the Emperor of the Han Dynasty, originated from the allusion of "the addiction of broken sleeves".

At that time, Dong Xian was engaged in telling the time at night. One day, Liu Xin met Dong Xian in the evening and was attracted by his beauty. So, he called Dong Xian to his side, studied him carefully, and found that he was more handsome than all the harem beauties, and later even let him wait on the bed. One morning, Ai Di woke up and saw Dong Xian still sleeping. Ai Di wanted to pull his sleeve back, but he didn't have the heart to disturb Dong Xian. But the sleeve was pinned down by Dong Xian's body and could not be taken out. But if you want to sleep, you have to do it in the morning, not until he wakes up. In desperation, Aidi pulled out his sword from the bedside, cut off his sleeves, and then quietly went out. At that time, the ladies-in-waiting also cut a sleeve. When Dong Xian woke up, he saw the mourning emperor's broken sleeves and felt the deep affection of mourning emperor. From then on, he became more and more gentle and lovely, and never left the emperor's side for a moment. Later generations called this story "the addiction of broken sleeves".