The novel is simply boring, you keep pointing out his anger issue, but to me, he is just a wuss.
His father was killed by a gang, he didn't look for them, didn't even make a scene even after meeting them by accident, no he simply continues to be a wuss, he even fights in their arena and gets trashed after they discovering that normal people don't simply recover from broken limbs overnight.
Still no anger, accidentally kills a thief and some criminals that kidnaped him? 6-10 chapters later he is still feeling guilty.
His acquaintance/friendship with that girl is completely forced, even her betrayal is forced and her reasons are stupid, did he feel guilty for killing her? NO, the criminals? he won't shut up about it.
He had 15 years to prepare, did he become strong? NO, all he did was training his muscles and become a useless paper hulk.
His powers are useless too, the main power of Sharingan isn't copying, it's genjutsu, and what will happen after getting the ms? will he go blind? will he become the strongest? will you nerf him? there is absolutely nothing in the breaker world that could ever beat the Susanoo or the Amaterasu.
His berserker mode is unnecessary, why would someone need two berserker skills? isn't that stupid?
His mother is hospitalized, did he start taking risks? no, what about his ki training? he is so afraid to mess something up and after finally starting?
He keeps saying slow and steady over and over again don't you get tired of repeating it?
Why didn't he try to get Han Chun-Woo to teach him anything? surely his Sharingan ability is much better than whatever Shi-Woon Yi has, he doesn't even need to show it, can't he take them both?
the Spirit Medicine (Dan)? the Shi-Woon Yi still got it, he doesn't involve himself in anything, there are chapters where he only does some useless school activity.
his revenge? his mother? his anger? and why don't you bother naming people? the recruit, the boss, subordinate..... seriously? even the alliance chief called him that...