Invincible with One Punch

A social animal from the earth traveled to another world and became the fourteen-year-old wasted son of his family who could not cultivate. His parents died and his engagement was broken off. After getting the One Punch Man system, he agreed to break off the engagement if he didn't break through after four years. The male protagonist followed the system requirements and trained his body ten times as hard as Saitama for four years, but he still couldn't practice. However, the system said that the protagonist had completed the training mission and ran away. This... What is this? This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.