Shi Niannian, wanting to recover quickly, had Mu Yin come over daily for joint practice.
On the weekends, Mu Yin always brought Mu Xiaohan with her, and Duoduo got along very well with Mu Xiaohan.
On Monday, Duoduo was waiting at the door on time for Mu Xiaohan to come over, but he only saw Mu Yin alone, and he asked disappointingly, "Aunt Mu, why didn't Xiaohan come?"
Mu Yin patiently explained, "Xiaohan went to kindergarten today. She goes to kindergarten from Monday to Friday, and only on weekends will I bring her over."
"What is a kindergarten?" Duoduo asked curiously.
"Kindergarten is a place where there are lots of kids. You can eat together, sleep together, and play together."
Duoduo nodded, not quite understanding.
…
That evening, Shi Niannian noticed that Duoduo was particularly downcast, constantly hanging his head as if he were troubled. She squatted down to eye level with Duoduo and asked, "Duoduo, are you very unhappy today?"