Cars have been constantly evolving. With the advent of the engine, horse-drawn carriages were replaced by automobiles, and electrification technology is now replacing internal combustion engines with electric motors. Recently, autonomous driving and Software-Defined Vehicles (SDV) have been driving further changes. However, even amid these innovations, one thing remains unchanged: the way a car moves. We often discuss a car’s performance in terms of engine or motor output. But what actually propels a car is the system that transmits energy to the wheels. No matter how much power is generated, if it cannot be transmitted efficiently, the desired movement cannot be achieved. This is why, throughout the automotive industry’s more than 100-year history, transmission technology has been just as important as power generation technology. So where does a car’s power originate? And will cars continue to move the same way in the future? The in-wheel motor currently under development by Hyundai Mobis stems from these very questions. As the name suggests, this technology involves mounting the motor directly inside the wheel; at first glance, it might seem as though only the motor’s location has changed. However, the in-wheel motor is regarded not merely as a simple relocation of a component, but as a technology that transforms vehicle structure, control systems, and—ultimately—the very possibilities of future mobility. Although development is still underway to verify reliability and ensure market viability prior to mass production, it is gaining attention as a core technology for future mobility, with its applicability being validated across various sectors ranging from passenger cars to PBVs and multipurpose autonomous vehicles. Most cars share a similar structure. In internal combustion engine vehicles, the engine is located at the front or rear of the vehicle, and the power generated there is transmitted to the wheels via the transmission, drive shaft, and