
Can someone tell me why in some manga like this one use chestplate only on the right side? Why not on left chest? Isn't it supposed to protect heart? Did actual person in the past wore it that way?

Think its because the right side is the prominent hand when battling. Especially with sword. So if your right side gets injured, you wouldnt be able to hold the sword. And basically screwed. Also when u are battling or charging an opponent your left side will kinda face away from opponent. So right side will be also be the easier target. But it al also depends on sword style or swordfighting techniques. If u are focusing on speed. Lighter armour is better or if u are one hit kill with strenght h dont need much armor. Also left side is also commonly used with a shield. (=・ω・=) well at least thats what I think XD

Well revenge is okay but what about the innocent people especially kids who might even didn't know the history of ex hero excecution. they didn't deserve to die meaninglessly.. that'd make the mc is as evil as the people who judge him and the hero in the past

He already knew that. That's why he's trembling at first. But he choose that path. The path where he will kill everyone and fulfill his revenge. Just imagine. If you got so angry, you don't have a control of yourself. Then what if you hate someone to death? Kids? Humanity? I don't think that's matter anymore when that happen.
But I must say that this mc still have a bit of humanity. Compare to this one revenge story I have read, the mc don't even care about children

READ THIS ON TORYCOMICS it's already ended(?) years ago

I searched it on Torycomics. I can't find it. I found it on manta instead but with only 26 chapters.
https://manta.fish/series/1169

I still dont like that white haired dude.. he trying to kill his savior and then give no apologize and keep his rude behavior after our mc persuaded her/his father to stop and even decided to help him...

Well I mean you can never be so sure of saviors you know. He obvi doesn’t know mc that well besides saving him and he’s assuming that mc knows the law of that country and how slavery is legal. With that, there’s no telling if mc would snitch on him or something you know? It was def a matter of getting them on their side or death. That’s how it usually is with the law. And the whole attitude was probably to get comfy with the mc maybe that’s his way of apologizing idk. I don’t like him either but I mean so far not so bad
This is why i hate kids