From Chinatown KM:

When legends becomes nightmares, will humankind gain control over the earth, or will they become an endangered breed...?

It all began when Chen Luonian was asked a certain question, "Do you want more or less time?". The island then exploded and monsters began to appear on Taipei's streets, schools and alleyways. Everything about them points to Chen Luonian. Even more surprisingly, his schoolmates happen to be super-skilled in combat. When he finally got home, he finds himself being attacked by some unknown beauty...!?

Apparently, the world had moved into a different future because of his choice and all this, was just the beginning...