This is the closest gym to Pyeongtaek train station. It's the biggest and newest of the three gyms in Pyeongtaek. 80,000/month or 380,000/6 months. Open M-F 10am-11pm and Sat. 3pm-9pm. It is a bouldering-style gym. Long routes are in three areas, plus a bouldering area. The walls were made by a company that installs climbing walls. They go out to nearby mountains like Jobisan on the weekends.
Enter the coordinates into Google Maps. It's located on the third floor.