The strongest upgrade

Zhao Fang brought the game system to another world and found himself a useless young master with no martial arts skills, and only a maid by his side. Faced with difficulties, Zhao Fang felt that it was time to show himself. Zhao Fang, who had extensive game experience, successfully found the system BUG, ​​worked hard to level up, went through hardships, entered countless secret realms, and completed various tasks assigned by the system…