I'm curious to know how often it happens that they depict death knights involved in the world of the living, where they are monsters and thrown out of a state of rest. Tell us more in the context of this picture, why is Yinshen drawn to the living?

So that you, as the author of the hero, understand, the closest description of the model of the behavior of the knights, you can change the terminator T-800, which follows the orders of the Order, the world of the living is closed to them and the brotherhood is above all than attempts to get hold of life, betraying and substituting loved ones.

The question is not intended to offend your creativity and serves to write works for fanfiction.

Well, I am an RP'er. And in Life she was close to her mate. So what brings her back to the living is simply coming back to them and "enjoying" their company, or even walk and try and enjoy what she did when she was alive now. Life was taken during the Legion invasion, then resurrected later by the Ebon Blade with the large new wave of Knights. She now tries to comprehend her lost timeframe and come back to her loved one even if that sense is dulled.
She is continually working with the Knights alongside of reaching to her past life.