Happy Fairy

An epoch-making 100% virtual online game was born, and Liu Hai entered the game intending to become a life player, relying on alchemy to make a living.
Accidentally but inevitably, Liu Hai discovered a bug in the game and found that he could use experience points to improve his skill proficiency.
"Ding! Congratulations on advancing your skill [Mining Technique] to the master level!"
"Ding! Congratulations on advancing your skill [Prospecting Technique] to the master level!"
"Ding! Congratulations on reaching the proficient level of your skill [Artifact Refining Technique]!"
Liu Hai shook his head again and again: "Hey! I upgraded by accident, so distressed!"
……
This is a story about a life player happily playing the game and accidentally becoming a fairy.