Xuanhuan: My system has a bug again

Introduction: [System + Invincible + Xiaobai routine cool text + no abuse point + easy + no heroine] After crossing the fairy land, Ye Tianyu was lucky to turn on the system, but this system seems to be... a bit seriously ill, either there is a bug, or it is on the way to a bug.This is gold?Although his art class is always occupied by the math teacher, he is not colorblind, okay?Reward: 1 chance of epiphany Ye Tianyu watched 99999+ epiphanies, momentarily speechless.Mathematics teacher, please apologize to the art teacher!Reward: [-] top-grade spirit stones Ye Tianyu took out [-], and there are [-], [-], infinity.System: What you take out is what you take out, and the reward of [-] is a fixed asset. Is there a problem?This is no problem.Chinese teacher, I suddenly know why I always...