"Your politics teacher is on maternity leave. This semester's politics class will be taught by an intern who graduated from University A. Let's welcome Teacher Zhang with a round of applause." "Crack, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak, croak." After all, he's leading a science class. Who has the politics teacher? If you learn mathematics, physics and chemistry well, you won't be afraid of traveling around the world. Having said that, the attention of everyone in the class, including Zhang Yangxiu, was attracted. Zhang Yangxiu stood up and looked at the tall man on the podium with frightened and surprised eyes. The love story of the two twin brothers who had not seen each other for 21 years (ahem) unfolded like this.