凉生，我们可不可以不忧伤

Liang Sheng and Jiang Sheng are brother and sister, although not related by blood. Nonetheless, they always stick together and support each other in their difficult life circumstances. They finally both manage to get into their dream university, but after a car accident, Liang Sheng suddenly goes missing. Jiang Sheng is devastated and doesn’t stop looking for him. Helping her by her side is Cheng Tian You who falls deeply in love with this ordinary but remarkable girl. But what will happen when Liang Sheng returns?