Alchemy of Souls (K drama series) - Season 2 - Episode 5

Jang Uk (Lee Jae-wook), once believed dead, has returned to life because of the powerful Ice Stone embedded in his body. Grieving the loss of his love, the sorceress Naksu, he has become a cold, ruthless hunter of soul shifters, using Naksu’s sword and the Ice Stone’s power to kill them. Each soul he destroys draws terrifying wraiths to him, and he lives increasingly isolated, building stone towers in the forest one for every soul he has slain and one for Naksu.