Army Life with My Childhood Sweetheart, the Handsome Officer

Li Wanwan transmigrated into a book, ending up inside a novel her roommate was reading. Her roommate, Qingqing, was a huge novel fan who had spent three out of their four years at university reading. This time, Li Wanwan still had no idea what the story was about. All she heard from time to time was her roommate shouting in the dorm, "Lin Yan is so handsome! He's such a perfect boyfriend! He and Tang Yun are absolutely made for each other!" From those scattered comments, Li Wanwan realized she hadn't transmigrated into the heroine. So was she a random supporting character? How had such a ridiculous thing happened to her, Li Wanwan?