We've Already Raised the Protagonist, so There's Nothing Wrong with the Waste Spot, Right?

Fang Yu only awakened his talent at the age of eighteen, and as a result... He got the best useless talent! The female classmates who used to be afraid of him suddenly changed their faces, and ridicule and humiliation followed one after another. Zhang Bo, the good brother who defended him, even had his arm broken and embedded in the wall! Even Shen Xue, the teacher who used to be kind to him, showed a mean face: "Shan Lingyun is a waste? Get out of the college! Tuition fees will not be refunded!" Just when Fang Yu was desperate and resigned to his fate, the world in front of him changed—— Above everyone's head, there are three words: [Controllable] With a thought, the injured good brother was instantly resurrected with full health! With another move, the good brother's talent soared, his cultivation skyrocketed, and his waist was repaired! Zhang Bo: "Hahaha! I have awakened to the system of getting stronger after being beaten! Brother, I will protect you from now on!" Fang Yu (the sixth child): "Yeah." So, a comeback against the wind: Arrogant and domineering Zhu Ling? He was slapped into a pig's head by his good brother's backhand! Shen Xue who sneak attacked Zhang Bo? Why did you slap Zhu Ling on the face? You want me to drop out of school? Sorry, my brother (me) has the final say in this academy! "Protagonist? Too tired, invincible? Lonely." Fang Yu watched his good brother pretending to be a slap in the face in front of him, while he hid behind the scenes and watched the show leisurely. "I just want to lie down quietly and be a waste, and my life will be bright..." … Until... A voice came from the depths of my soul... "Eighteen world masters... The eighteen spiritual essences have become... It's time to harvest..." "What? I'm the final BOSS?" Fang Yu looked at the protagonists he had raised, the eighteen radiant world masters, and then at his useless self. People... Numb.