昨日的欢笑

李振毕业后，只身一人来到了济南。他在大学校园里靠贴广告、收发快递为生。业余时间他喜欢弹吉他、打太极，研究书法和中医。一次偶然的机会，他成为了一个课外辅导班的老师。本片主要记录了他在辅导班与学生们的快乐时光，以及一段埋藏在心底的暗恋故事。
　　After Zhen Li graduated, he came to Jinan alone. He relies on posting leaflet, sending and receiving courier parcel to make a living in the university campus. In his spare time, he likes to play guitar, play Tai Chi, study calligraphy and Chinese medicine. By chance, he became a teacher in an extracurricular tutoring class. The film mainly records his happy time in the tutorial class with students, as well as a secret story buried in his heart.