Yang Zeyu, an engineering male, accidentally implanted an APP software on his phone that could travel back to the past while writing code and submitting homework. At first, he didn't know that this software was a girl who had a crush on him - MilkWritten by Tea Classmate. He used the technical means of this software to repeatedly traverse and defeat several competitors who were pursuing campus beauties with him - Shu Yu. But as the plot develops, Yang Zeyu's roommatesQin Yong, also a male classmate who has a crush on Shu Yu, stole Yang Zeyu's software and attempted to use it to save the beauty with a desperate hero, pursuing Shu Yu