Zhuo Yang has been told since he was sensible that his brother's natural frailty is due to him. You have to give in to your younger brother, you have to take care of your younger brother, and you have to be responsible for your younger brother's life. Growing up, the room belonged to my younger brother, my parents belonged to my younger brother, and my dreams belonged to my younger brother. My brother is everyone's treasure.
But Zhuo Yang doesn't care, because Zhuo Yang is Dong Sen's baby. Dong Sen, who would sing lullabies to him to lull him to sleep, who only served as a model for him, and who said he wanted to give him a home, were the only ones Zhuo Yang didn't want to let go of.
But such a good Dong Sen was lost by Zhuo Yang.
Zhuo Yang: Brother Sen, I realize now that the person I am most sorry for is you. Can you... Forgive me?
Dong Sen: Baby, thank you for having the courage to let yourself go for me.