AU/TaengSic time travelling part 1 (this fall under what genre?)

Taeyeon, 20 years-old, slept at a class she was attending. But when she opened her eyes as she woke up, she was sitting inside a café instead and not in the classroom.

Confused, she mindlessly grab something on the table, it was a cup of coffee and she took a sip. What? As if she knew what she was doing, as if it was something she's supposed to be doing. Then, she mindlessly dusted off her coat, What am I wearing, she was in a corporate attire. Her brows furrowed as she examined her outfit.

"Are you okay, Taeyeon?" A girl appeared all of a sudden, pulled a chair and sat opposite of Taeyeon.

"Ah, yeah. Yeah of course, Jessica." Jessica? Dazed, Taeyeon had never met any Jessica before. But the name slipped from her lips, like, it's so normal and carefree.

She looked away; in a split of a second, time passed by with her and as she looked back she was back in her classroom and there was no Jessica, she wasn't sitting inside a cozy cafe, but she's back in her classroom with her busy classmates taking notes of the lecture.

She grinned in disbelief, pulled her hair back as she thought, "Who's Jessica? What the hell was that?"

Never did she know, someone from afar is just as confused as her. "Who the hell is Taeyeon?"