Who knows BTS butter!!!!

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Across
  1. 3. Highest selling album of all time
  2. 4. How many mixtapes have BTS members collectively released
  3. 5. Month and year BTS first tweeted
  4. 10. which song won Song of the Year at MMA 2017
  5. 12. "Path" is a hidden track of which album
  6. 13. First BTS album to enter the UK Billboard Albums Chart
  7. 14. Theme of BTS' fourth muster
  8. 15. Instrument Yoongi played in high school
Down
  1. 1. Album where secret track "Sea" is hidden on
  2. 2. when did V create the meaning of "purple" for BTS and ARMY
  3. 6. Music awards BTS first debuted in in the United States
  4. 7. Month and year of ARMY's birthday
  5. 8. which song led BTS to their first win
  6. 9. Name of BTS first variety show
  7. 11. First BTS music video to reach 100 million views on YouTube