Naksu

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Naksu, the shadow assassin, also known as the strongest mage, has soul shifted to Mu-deok. You are Jang uk and this is set when park and seo yul took Jang Uk and mu-Deok (Naksu) to the secret place to veiw Naksus body frozen. This is when Jang uk finds out it’s Naksu and not Mu-Deok in the body.