Song Ying fell in love with Song Yin who helped her during military training. In order to deepen the mutual understanding between classmates, the school launched a game called "I am your exclusive angel". In order to create an opportunity to communicate with Song Yin, Song Ying used small tricks to let Song Yin draw her name and become her "exclusive angel". However, in the end, she discovered that the "exclusive angel" who chatted with her anonymously online every day was actually someone else...