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Their first meeting - paljae being the north king who killed his subordinate cuz he's emotionless/Hunted-meets Rheong/Ryeong took a curse that was aiming at Paljae(a curse that wasn't allowing his soul to return to his body->Died, but Ryeong transferred it to himself and forced his soul back into his body via his ice power->amnesia of that time.
Paljae is a creature with overwhelming Yin energy & Munryeong overflowing with Yang energy. Jae soothing the raging energy in Ryeong & Ryeong filling the hungry void in Paljae.
amnesia if having amnesia/Master's death arc?
Paljae