Thus, Zheng Zetian focused entirely and attended two long lectures in succession, sitting for four hours without realizing how time had flown by, feeling he could continue. When he turned to look back after class, that 'Apron Senior Sister' was already nowhere to be seen.
That's understandable; after all, everyone's time is valuable. While you're sweating over books in the library, she's enjoying her youth at bars and clubs. It's not like anyone's just going to wait around.
But as the saying goes, whether or not the train changes tracks, someone's bound to get run over regardless. The difference is whether it's one person or a group. Fate is the same; thus, even though Zheng Zetian missed the chance for private 'discussion of the Dao' with the Apron Senior Sister, as someone so entangled in destiny, he naturally never lacks side plots or, so to speak, celestial encounters.
In fact, before he could even leave the classroom, a plot had already found its way to him.