She was his precious girl.
When he was six years old, his adopted mother gave birth to Fang Xinxin. Her cuteness caused him to become enamored with her.
During his youth, he earnestly wished to quickly grow older so that he could protect her.
It wasn't until he got older that he realized that his feelings for her had not just grown deeper but also deviated. From mere kinship to sibling love to…
He had started to love her, extremely, deeply, madly.
He wanted to marry her, and take care of her for the rest of her life!
In the Fang family, she was the real daughter and he was merely an adopted son.
Thus, since young, he worked hard to remain the valedictorian from elementary school till college.
He hoped that when he finally became an accomplished man after entering the society and thus became worthy of her, he would be able to tell his parents about his heart's desire.