행복 빈도 : 세로토닌, 도파민, 엔돌핀 릴리스 음악, 이명 (Binaural Beats) 편안한 음악 from 3s 5frkgb7c Watch Video
Preview(s): Play Video: (Note: The default playback of the video is HD VERSION. If your browser is buffering the video slowly, please play the REGULAR MP4 VERSION or Open The Video below for better experience. Thank you!)