The two A's, Xu Ke and Xie Chao (zhao), grew up together. They have been in love with each other for a long time, but they are both A's and they can never be together.
Xu Ke could give up everything for Xie Chao, his dignity, property, life... But Xie Chao wouldn't. Xie Chao loved Xu Ke, but he loved himself more.
Xie Chao's parents took it upon themselves to get engaged for Xie Chao. After Xie Chao found out, he was hesitant to break off the engagement. He wanted to be with Xu Ke forever, but he still had a grudge against his and Xu Ke's gender. In the end, when Xie Chao truly understood his heart and left Xiao O to find Xu Ke, Xu Ke had already jumped off the tall building.
"Do you really love me?"
"Yeah."
"Then why don't you mark him?"
"..."
(In ICU)
"Ake, I'm sorry, I love you, I really love you, don't leave me, I really love you, I have always loved you."
"..."
Xie Chao could no longer hear Xu Ke's voice, and could no longer hear Xu Ke say she loved him in his ears.
Mission: Small world, happiness first