According to legend, Janus had two faces: one in front, looking toward the future; and one behind, looking toward the past. At the same time, Janus held the key to the door in one hand and the guard's staff in the other.
In Baichuan, Yang Anling's life is prosperous, and Yixing's success allows her to hold the key to a bright future; the past that is incompatible with the present has been tightly sealed in the deepest part of her heart, and the long stick of vigilance always blocks its contact with the outside world.
Ten years of wasted years, thousands of miles apart, a world of difference in identity, and a gap that made her relax her inner guard. But this moment of negligence made the past and the future entangled again. Key and staff, future and past, what choice will An Ling make now...