I Crossed Into Another World and Met You Again

Two modern female agents discover a headset that connects to another world and travel there. They join the Northern Domain Academy and one by one find their former teammates, 002, 005, and 006, then form the Northern Domain's Fourteen Blades. Just when they think they've found everyone, Lu Cheng and the others uncover the secret of the Northern Domain's Heavenly Book: several mysterious cards with the power to transmigrate through time and space. Later, she unexpectedly sees her uncle in the other world. The others have also found people they care about there. Will they return to the modern world? How will they choose between the other world and the modern one?