Yilin looked at the man beside her. The man was looking at the girl. His flowing facial features were soft and open. He seemed to be in a good mood.
Yilin wanted to look at him again. But Yin Muchen had pulled out his long legs and went beside the girl.
He asked, "Which question do you need help with?"
Yin Shuiling bit her lip with her pearly white teeth. She was very shy, but she said in a righteous voice, "Older Brother, these questions are Olympian math questions/ They're more difficult. I don't think I can do any of them. Older Brother, teach me one by one."
Yilin: "..."
Yin Muchen didn't have much of an expression. He bent down. His right hand went around her shoulder, and held her right hand that was holding the pen. His gaze was focused on the question. "The first question is geometric application..."
