Olympiadunlimited Heartbeat

Zhou Huan&Qin Xubo Liu Yuning&Yang Yuchen "Qin Zubo, I want to have a future with you." "Qin Zubo, you like me, I will listen to whatever you say from now on." ————Zhou Huan "Liu Yuning, don't cry, in my eyes you are the best." "Liu Yuning is the one who I, Yang Yuchen, favors. Who dares to touch him?" ————Yang Yuchen. "Qin Zhunbo, choose me. I can give you whatever Zhou Huan can give you!" [When I passed the exam and got into the Mathematical Olympiad class] Derivative.