Tang Ye was doing more than just extending Guan Tiexi's life; he was also extending the lives of other patients. This was to ensure they could hold on until the day after, when Tang Manhong formulated the antidote, and then everyone could be saved. Perhaps it was a pursuit of perfection, but if he could save everyone, why not strive for it?
Tang Ye had always been a person who fought for what he wanted, so even if it meant overextending himself, he was determined to complete the task. This moved Tang Manhong, who had been by his side the whole time. Although this guy could be ruthless and more vicious than anyone when he got angry, he was inherently righteous and kind. A flaw doesn't hide the virtues, right? This guy had plenty of faults, true, but having one reason that moved her heart was enough.