JSJoonsik SeoFollowUsage metrics Co-workers & collaboratorsJJJoonyoung Francis JoungSeoul, KoreaJoonyoung Francis JoungSPSungnam ParkSungnam ParkYSYoung Ji SonYoung Ji SonJNJaegeun NohJaegeun NohJKJong-Man KijmJong-Man Kijm