Seal All Heavens

He traveled to another world, and the blue birthmark on his forehead turned into a training mark. In this world, marks are divided into seven colors - gray, red, orange, yellow, green, blue and purple. Cyan is not among them. Everyone said it was a no-brainer. Until the crisis came, anger ignited the seal, and the black demonic energy awakened in his body. An old voice sounded deep in his mind: "A soul that does not belong to this world... You are the first in all eternity." He finally understood that cyan was not a random brand, but the source of ten thousand seals. The world-destroying demon is sealed in his body, and every time he gets angry, the seal becomes looser. He is not the Chosen One. He is the final seal.