The day before Jiang Mianmian's birthday, while she was taking a bath at night, she removed the pocket watch and placed it in her dirty clothes to prevent it from getting wet.
After her bath, she didn't notice the pocket watch had fallen to the ground as she carried her dirty clothes back to her room.
The next morning, when she was getting ready to go to school and wanted to check the time, she reached into her pocket but found it empty, and panic immediately set in.
Since Yu Cheng had given her the pocket watch, she had treasured it and worn it every day.
She thought back carefully and considered that it might have been left in the bathhouse the day before, so she hurriedly went to look there, but the bathhouse was empty.
She then meticulously searched the yard, turning over every leaf, but still found nothing.
