On the rug, a little boy about two and a half years old sat quietly, building a block house. After placing a few blocks, he would glance at Lin Wan.,He Minmin looked at her watch, it was getting late, and she had other things to do. She said, "I'll go first then. Call me if you need anything.",Lin Wan's heart skipped a beat, and she was almost startled out of her wits.。