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I would like to briefly introduce my research interests, which lie in black hole physics and its applications to high-energy physics and gravitational-wave astronomy. First, I will discuss the phenomenon of spontaneous scalarization of black holes, which provides a new mechanism to evade the no-hair theorem. Within a simplified Einstein–Maxwell–Dilaton (EMD) framework, we have investigated the scalarization of Reissner–Nordström black holes. In this model, we identified two types of hairy black hole solutions: one induced by the scalar potential and another arising from nonminimal coupling. I will show that the improved EMD model, which indicates a first-order QCD phase transition, can be understood in terms of the transition between these two classes of hairy black hole states. Subsequently, I will briefly introduce our studies on gravitational waves from extreme-mass-ratio inspirals (EMRIs), with a focus on testing modified gravity theories and probing black hole physics through observations. As a recent example, I will present our work on scalar field detection in a Kerr spacetime.