Shi Xiaoqin lost her mother in childhood and was placed by her grandmother in a hallway storage room for three years. Although she faced cold treatment, she often received anonymous food. After growing up, she became an auditor, and an audit revealed that her benefactor was actually her grandmother. Her grandmother suffered a stroke and lost her speech. From a lesson preparation notebook, Xiaoqin learned that the coldness back then was actually protection, and the warmth all came from her grandmother. On New Year's Eve, the grandmother and granddaughter finally reconciled, untying a knot of nineteen years.