Help! Why Is My Supposedly Aloof Master Such a Goofball?

The System told me to save the darkened villain, so I promptly joined his master’s sect and became the pampered little junior brother. Every day, I stir up trouble and sow discord, just waiting for our master to personally purge the sect. But the villain never turns evil. Instead, our master takes the lead in shipping us together? Then, with me pinned beneath a peach tree, Master says with an amused smile, “Done with the plot? Time to move on to the romance...” I look down at the crimson gauze robe I’m only supposed to wear at my wedding, my eyes wide with shock. “W-wait... This isn’t how the story’s supposed to go!”