Transmigration: Who on Earth Am I?

Jiang Yun woke up to find herself transported into the hellish world of senior year of high school. Struggling desperately but unable to change her fate, she could only resign herself to it. Determined to study hard and alter her destiny of ending up in a factory, she was instead forced into a complex and bizarre emotional entanglement. The strange interactions with He Ningyang, the ambiguous words of her homeroom teacher, and the various mysteries of this world... Why am I here? Is this world real or fake? And who exactly am I?