There are basically 3 kinds of accommodation available in Boryeong.
The most popular ones are motels. They are easy to be found because they are all over the place in this beach area. There are also many hotels. You can tell the difference between a motel and a hotel by the size of the building. Buildings that are more than 5 stories and larger in size are hotels. The quality of the room is not much different, but they have more facilities that customers can use such as spas, swimming pools and restaurants.
If you do not mind experiencing a Korean-style house for couple of days "minbak" a private residence temporarily taking lodgers is the one for you. In fact, there are more "minbaks" than any other accommodation, because for many people there, it's become another way to make a living.