Yes but the guy that helped Yoonsoo dispose of the body is a half too and he can move fast and is almost undetectable, and even if he doesn't know where she is I still believe that he can simply go to the mansion and detect their smell from there, then if he goes again as fast to Yoonsoo he's probably gonna help him escape father, he'll just have to practice teleporting, that's they best solution I can think of