Clovis's Answer

Bam!

A guy slammed the table hard while glaring at Ragna.

"What the heck did you do earlier? How could a guardian be so weak?"

"I'm sorry, I will do better next time." Ragna lowered his head, his face was already pale. 

"There's no next time. Go away!" The guy kicked Ragna. "Hmph. You almost killed one of our members! You freaking sissy." 

Ragna didn't say anything. He didn't have the experience to become a guardian. However, the only thing he knew was that his constitution allowed him to take a beating, so he chose to become one.

He had lost everything in his former city. When he wanted to take his own life out of misery, he remembered the kindness he had experienced in that orphanage.

There was no way he could choose the easiest path of all. 

Hence, Ragna did all kinds of jobs in order to survive. He let people beat him and once he was old enough, he became an explorer.