《红旗下》是一部反映个人成长的现实主义短片。单亲家庭长大、自由要强的艺考生依依冲破层层选拔，得到了大型文艺汇演领舞的角色。不料很快她发现，自己的成绩是因为母亲悄悄向老师送礼所得。面对世俗的眼光和自己良心的拷问，依依第一次明白成长的代价。A driven and conscientious girl at China's premier dance school gets the lead position in a prestigious performance but struggles to accept it after she learns that her mother has bribed the teacher to buy her the part.