Lin Guang, a middle school student who traveled from the earth to another world, was considered a useless martial soul. However, a teacher discovered that he was a top-grade demon soul, and a dual-system demon soul that had not been seen for thousands of years. He devoted all his efforts to Lin Guang, taught Lin Guang everything he had learned and worked hard in his life, and hoped that Lin Feng could become a demon saint standing on the mainland! Lin Guang lived up to his trust and found a few good brothers. (As the saying goes, he lied to his parents at home and his friends when he went out. Bah.) Finally, after going through all kinds of hardships, he accepted the inheritance of the hell demon Abat, helped his college overcome difficulties one after another, helped his country, and won battles after battles. By chance, he returned to Earth.
[Ps: Please collect and comment a lot, I will try my best to finish it!