Contract and the Demon King

The boy named Ye Yang had been living an ordinary life, but one day he got something called the Book of the Demon King inexplicably because of a phone call.He was also told that if he didn't get the feather within a month, he would die.
Since then, his fate has returned to the right track...
A different demon king, a different journey across time and space, and the girls who made a contract with Ye Yang.Facing these, what will Ye Yang do?And in the end, will he be able to fulfill his little ambition of building the Crystal Palace as a man?All of these will be shown to you here...

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