Was it the fragrance of his soul?!
It was not about the physical body that Di Fuyi occupied! Whichever body he used would carry this fragrance. The question was, did Gu Xijiu have a unique ability to smell this fragrance instead of body odor? No, that did not make sense as she could detect the odor change in different individuals when she interacted with them. Sometimes, it smelled good, but sometimes it was disgusting!
Even when she was with Long Siye, she could sense his odor change from time to time. There were several types of herbal fragrance on his body. But when she was living in Di Fuyi’s body, she specially sniffed the fragrance of his body but could not smell anything. However, when he drew closer to stabilize her soul just now, she smelled the fragrance again!
The only explanation for this is that she was smelling the fragrance of his soul! She was wondering whether other people could sense it.