Unconsciously Become the Strongest

He was originally an ordinary high school student. He arrived in a fairyland in his sleep but was chased by a ferocious beast. The system triggered when he was about to die saved his life. When he woke up the next day, he thought it was a dream and felt exhausted. After that, he continued to have similar dreams every day and his body was sore and exhausted every time he woke up. Little did he know that this was closely related to his later becoming the strongest... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.