Chuan Cheng Zongcai Wen Li De Mishu

Yan Dun transmigrated into a CEO romance novel as the miserable secretary. He originally thought his task was just to be a tool, observing the romantic entanglements of the Mary Sue and the CEO. However... the situation became increasingly strange. Why did the scenes that originally belonged to the Mary Sue seem to be silently shifting to him? Wasn't he just supposed to be a tool? How did he seem to become a heartthrob? (Source: Bilibili Comics, translated)