Transmigrated as Yinsi, I Climbed Yixiu's Wall at Night to Save Someone

One moment he transmigrates into the Eighth Prince, Yin Si, from Scarlet Heart; the next, he’s climbing over the wall into Yixiu’s courtyard next door. System: ... [Host, are you the sly one, or am I?!] Yu Laoer: “The sly one? Heh. I’m a descendant of the Meng, a medical lineage.” His first move is to save Honghui’s life! Having accidentally transmigrated into the Qing dynasty, Yu Laoer has no intention of living a miserable life like Yin Si! Since the System won’t let him change history, he can only make things difficult for Yin Zhen! To change his original self’s wretched fate and earn enough sly points, Yu Laoer has to rack his brains and keep coming up with all sorts of outrageous schemes... To earn enough sly points and transmigrate back to the modern era to take revenge, Yu Laoer shows no mercy at all. But an unexpected turn of events leads the System to send him back first, and the timing couldn’t be worse... Yu Laoer strikes without hesitation and gets his revenge first! Then he transmigrates back to the ancient era! The System guarantees once again that as long as he completes this world’s mission, Yu Laoer will get one more chance to transmigrate back...