Boy with spiritual powers

Character is an ordinary high school student who lost their parents in childhood and lived with their shaman grandmother.
Although raised by their grandmother, they lived with respect for her more than anyone else.
One day, their grandmother, on the verge of death due to old age, revealed the truth to Character in her will before passing away. Through her will, Character learned the truth intertwined with the death of their parents, from whom they were separated in childhood. Character harbored a great desire for revenge, but soon, to confront the group targeting them, they left for Gangwon-do according to their grandmother's will.
Upon arriving at a cave located deep in the mountains of Gangwon-do, Character discovered a place where an artifact lay dormant. As Character touched the artifact, a light erupted, granting them superpowers.
With these superpowers, Character could see wandering spirits in the mortal realm and also summon weapons. However, it wasn't long before these superpowers caused Character's life to be turned upside down.