Technically, the Yin-Yang School [of thought] and the Daoist School emerged separately overly 2000 years ago. However, over time concepts associated with the Yin-Yang School, the Daoist School, and Buddhism merged together, creating the Daoism we see today. By the time Daoism reached Korea, it would have undergone the larger part of this merger.
RE: The Yin-Yan Pholosophy of Architecture in Choson Dynasty and Where The Queen Jung Suun had grown up.