This paper presents a four-channel bidirectional control system for high-speed teleoperation using an inexpensive manipulator. While conventional one-way control schemes have difficulty in high-speed or high-contact tasks due to the lack of force feedback, the proposed system utilizes four-channel bidirectional control to accurately identify the manipulator dynamics model without force sensors and provide force feedback through nonlinear term compensation, velocity and external force estimation, and variable gain control according to inertia changes. In addition, we show that the performance of imitation learning can be improved by integrating force information into the input and output of the learned policy using the data collected by the four-channel bidirectional control. Through this, we demonstrate that high-precision teleoperation and data collection are possible even with inexpensive hardware.