"In his case it was. He was well versed in magic and curses. When he died, his body died with him but his soul, it didn't. His soul remained on earth, he wanted to be powerful and rule the world. He tried to play tricks with people to reach this power, those were the people who attacked him to kill him but when they were attacking him, they heard someone approaching and they got scared and ran away. The people who approached the almost dying saint were Park Hye Min and Lee Ji Woon but they didn't help him and left the saint to die. Before dying the saint made a curse charm and put his last breath in cursing Park Hye Min and Lee Ji Woon. His soul which is still on earth has been controlling their lives and ending them in tragedy."
Ling Xao explained everything
"Why didn't he curse the people who attacked him?"