C745 Master Black Gas

"Master, but I still don't quite know how to control the black air." Wang Tianyu smiled awkwardly at Chen Yu.

Chen Yu did not blame Wang Tianyu either. After all, the appearance of the black aura in his body was purely an accident. Furthermore, the appearance of the black aura in his body did not fulfill his duty as a teacher.

"It doesn't matter, you can do it bit by bit