Realm Key: the Door Connecting Two Realms

When Li Zhengming, a cultural relic restorer, was repairing an ancient mirror from the Tang Dynasty, his blood activated the seal in the mirror, and his consciousness traveled to a parallel fantasy world and possessed the young master of Tianji Pavilion who was poisoned. He discovered that half of the boundary stone was sealed in his body, and the other half was in the modern world. A time traveler from a thousand years ago, a national master tried to use the boundary stone to open up the two worlds and revive the aura of the real world, but this would lead to the collapse of the mirror world. Li Zhengming must juggle between two identities, while finding out the truth behind his family's annihilation and preventing this double world catastrophe.