High school students Meng Kerou (played by Gui Lunmei) and Lin Yuezhen (played by Liang Shuhui) are good friends who talk about everything. Yuezhen tells Kerou that she has fallen in love with a boy named Zhang Shihao (played by Chen Bolin), and she often asks Kerou to help her get close. Zhang Shihao, help get to know him and help deliver love letters. Unexpectedly, Zhang Shihao thought he was happy...