I found this one and look what I learned about the new song BTS released.
Just in time after BTS officially released their first full album, KBS take a note for their 4 songs which is labelled inappropriate.
2nd Grade (2학년), Look Here (여기 봐), Cellphone (핸드폰 좀 꺼줄래), and BTS Cypher Pt.3: Killer, are the list of BTS new songs which are deemed to be unfit for broadcast. It may be because of the lyrics for saying vulgar jokes, brand, and other reasons.
However, this won’t affect BTS promotion as they promotional song “Danger” is passed for broadcast. BTS is making their comeback with full album which contain 14 songs. The MV and album was released on August 20th and they also held a comeback showcase on August 19th.