Mysteries:Lord Of The Dream Realm

Meng Xian, transported into the world of "Lord of the Mysteries," initially believes she's in a parallel universe. However, when she recognizes her colleague Zhou Mingrui as the protagonist of the novel, she realizes she's in a world destined for destruction. To survive, she devises a plan to befriend Zhou Mingrui and gain access to the Sefirah Castle, a place of immense power that might shield her from the impending doom.

The good news is that Meng Xian has arrived long before the main events of the plot begin
The bad news is that the plot's events are far off-thousands of years away.

But her plan takes an unexpected turn when she discovers a mysterious book in the store This book, infused with the power of dreams, drags her into the ancient 2nd Epoch, far from her carefully laid plans.