Ye Ran accidentally activated the "Martial Arts Achievement System". While others practiced martial arts diligently, he relied on completing outrageous tasks such as "killing 3,000 chickens" to soar his health and vitality. From being unknown to being number one in the school, he hid his strength and entered an underground fighting arena to earn money for his family's surgery. He was accidentally involved in the conspiracy of the mysterious organization "Black Seal Tower". In order to protect his family and explore the truth behind his parents' disappearance, Ye Ran broke through his limits again and again in battles with monsters and transformed humans. In the end, he defeated the crazy villain, became a hero protecting the city, and discovered that a greater world crisis had just begun.