Beneath Yicheng lies a door.
The oldest door in the world. No one knows what's behind it. The Empire says it's an ancient ruin. Scientists say it's an energy node. The millions of people in Yicheng say it's the aurora in the weather forecast.
Only a handful know the truth: the door is cracking. The seal is weakening. Whatever lies behind it is about to come out.
Shi Su knows. The secret he's kept hidden for over a decade has something to do with this door. He was born with two spirit contracts. His first spirit contract is Time; the second is called Spirit Pact, a one-of-a-kind power of the plundering type. But he doesn't dare use it. If it were exposed, every faction would hunt him down.
Then, on the day a crack appeared in the door, he met another person with two spirit contracts. A girl who was also hiding her abilities and resisting the plans others had made for her. A black mark and a silver mark lit up at the same time on their wrists.
Twins are the key, time is the lock, and the spirit pact is the key that turns it. When all three keys come together, the door can be opened.
And behind the door, a gray-eyed man has been waiting for twenty years. He's no good person. He doesn't care what happens to the world outside. All he wants is to tear down this door and reunite the two worlds.
