need help

I am trying to find a manhwa i can't remember exactly just some bits and pieces - there is one scene where this guy could be shaman invited by the this rich family to look into their son who is by the very aggressive and violent, he smack things left right and harass even helpers of the house. When this shaman guys arrives in that rich guys house he saw him standing near a tree in the garden wearing a oni mask like thing. That all i remember. If anyone know the name please let me know. Thank you