YOU SAID:
Do you know bangtan sonyeondan?
INTO JAPANESE
Bangtan sonyeondan を知っていますか。
BACK INTO ENGLISH
Bangtan sonyeondan you know?
INTO JAPANESE
Bangtan sonyeondan ご存知ですか。
BACK INTO ENGLISH
Bangtan sonyeondan you know?
Come on, you can do better than that.