Go to Daum Pod Player Settings (After launching Daum Pod Player, press F5 on your keyboard, or right-click to enter preferences.)

Go to Sound-Normalizer / Reverberation on the left as shown below and check Uncheck Normalizer when playing.

 

* For reference, normalize means to set the sound to 0db (dbFS). For example, an algorithm that amplifies the sound volume by 0db when the sound being played is -20db is called normalization. This makes the sound louder, and at this point, you may hear a sound that is torn apart.

(The db used here is dbFS, not decibels.)