A mother attended BTS' concert for a very special reason. 

On January 21, Vietnamese media outlet TIIN shared the heartbreaking story of Bui Dieu Kl. 

Bui Dieu Kl was a 15-year-old Vietnamese ARMY who was battling cancer. Despite her poor health conditions, Bui Dieu Kl excitedly prepared to attend BTS' concert in Singapore on January 19. Unfortunately, Bui Dieu Kl passed away on December 20, 2018.

The young ARMY couldn't attend the concert herself, but her mother fulfilled her dreams for her. Bui Dieu Kl's mother shared a letter, stating,

"My beloved daughter! 

I came to Singapore to see BTS. I know very well how much you waited for this day. 

My beloved daughter, you were counting down to this day and you exercised till the very end in order to meet the people you love. Throughout the past 3 years, I know the lovely 7 members were a big motivation that helped you battle the illness. Especially Jungkook. You and I talked about Jungkook every day. I called Kook my son-in-law and every time I did, you got so excited and couldn't hide your excitement. 

You must be in heaven now. Are you happy there? Buy everything you want there. Buy everything that I couldn't get you. You can get everything you want there. Don't worry about saving money there. I know you worked hard to save money for your mom. 

My beloved daughter. Do everything you want. I love and miss you so much. I will send this letter to you, and to the world where Jungkook is."