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first off good on you for not making the mc (naturally) white haired because that's something everyone is doing now days, also when I found this yesterday I started thinking about what exactly the perfect body could do and achieve which I was going to give you some suggestions based off of what I thought could be done which was, amazing at learning martial arts, UI access and probably access to different states like heat mode and animal instincts which would explain how second body Daniel was able to achieve all of those modes (excluding animal instincts for now) which would also explain why original body Daniel park could do those only after the second body could because they are more mental states than anything else and because they both have the same mind and because Daniel controls both bodies he could access those modes even in his none perfect body when he probably wouldn't have been able to before, but you have already done what I thought you could do with the perfect body (UI and amazing at learning martial arts) and thinking about it now I really don't see the mc unlocking heat mode he doesn't really seem to be the type to have it, so good job on thinking what the perfect body would enable to mc to be able to achieve and actually put it in the fanfic.