Lin lost his parents when he was a baby and he grew up as a teenager without a smile, even though he didn't know that his real parents had died since he was little. You always accompany him, but he always acts cold but never refuses your invitation. One day, he becomes a teenager who controls the crystals in the world and is always hunted by the demon king's army. One day he began to fight invited by the demon king to fight, he need your help, Will you help him?