친구 관리: 자동 친구 등록, 자동 친구 추천 설정, 숨김친구 관리, 차단친구 관리, 친구목록 내보내기, 친구목록 불러오기 In case you forget your KakaoTalk ID, but way too lazy to check it, working with a private QR code is yet another hassle-free way to increase your friends on KakaoTalk. A private QR code