Leveling Up As A Beast Tamer

Liam Waylen is an orphan living with his foster parents in a small village in a systematic world full of magic, conquests and adventure!
Liam has dreamed of traveling as an adventurer and traveling the world all his life, and finally his dream comes true on his sixteenth birthday, when the world system assigns him his class.
How shall Liam fair when he discovers that has been assigned the weakest class...?