Sima Yinghui's eyes were sealed due to special reasons at the age of five, and that's when he met Nangong Yu. After Nangong Yu met him for the first time, he said that he would marry Yinghui when he grew up.
Unexpectedly, when they met again when they grew up, the boy who said he wanted to marry him grew up. Yinghui recognized him, but Nangong Yu refused.
In the end, Yinghui, who was deeply hurt by Nangong, realized that it was not his eyes but his heart that was blind at the beginning.