Focusing on Xiaoxiang Shen's The Return of Kim-tshai (2018), this essay analyzes the process of how this fantasy-detective novel transforms yōkai into part of Taiwanese folklore culture. First, this essay explicates the question about why the Japanese colonial period becomes indispensable for producing yōkai. This question leads to the further investigation of how the past history responds to various issues in colonial and post-martial-law Taiwan and Taiwan's cultural subjectivity in relation to the world. Second, this essay based on previous discussion examines the author's ideas about writing fantasy-detective novels as a genre and his writing techniques of switching time and space to historicize and locate indigenous yōkai in Taiwan. The final part furthermore examines how this novel borrows Confucius philosophy and a way of "speaking" to create the ontology and breeding technology of Taiwanese yōkai.