I fell in love with you the day I disappeared

The introverted girl Fang Xiaoying has been easily ignored since she was a child. One day, she found that she had been forgotten by everyone and became a completely transparent person. In despair, she accidentally discovered that only Yu Zhiang, the school boy who had had a misunderstanding, could see her. The two reached a contract, and Yu Zhiang helped Fang Xiaoying agree to find herself again. The two developed a good relationship with each other through "two-way protection", and Fang Xiaoying gradually regained her confidence. However, one day, Yu Zhiang found that he could not see Fang Xiaoying...