Reborn, Then Unlock the Second Love System

[The Blue Star Love System has been bound to the host: Li Dongsheng, the object of his heart: Dong Lixia] [Mission success rewards the host with complete mastery of high school mathematics] [The earth's love system has been bound to the host: Li Dongsheng, the object of his heart: Chen Xi] [Task reward: Earth song "Best Losing Friend"] Li Dongsheng, a Blue Star man who was eighteen years old again, was full of questions. Why do I have two systems? Why are the heartbeat objects of the two systems different? Why does the love system reward me with songs? Why is the reward of the love system proficiency in high school mathematics? What is the earth? Li Dongsheng was completely confused...