A Magician from the Outside

A Russian guy after a ridiculous death is reborn in the world of ranobe "full-time magician", of which he was a big fan. However, he was reborn not into the main character or his friends, but into the body of an unknown seven-year-old boy. After wandering around the city, he finds out that the main characters of ranobe are also seven years old. Taking advantage of Mosin's good nature and taking the Chinese name XinyUn, he becomes an adopted brother for the main character of the original Mo Fan. What will change from his appearance and will he save those who have suffered a sad fate?