The title of the song has been revealed by the actress Gu Hye-sun before the day of release through her Instagram.

'Without time to look back to loneliness / Every night in your dreams / Tonight drunk and sleepy / Is there a better tomorrow than yesterday / Hope is despair and memories are sins / Your breath in my ears / Unbearable farewell Why should I live?

In the lyrics of "Must I Die?" it contains the sufferings of Ahn Jae-hyun, a husband, and the sufferings of Ku Hye-sun in a divorce lawsuit. Ku Hye-sun's desolation of loneliness is implied in the last lyrics 'You / I'm not.'

In the lyrics of "Must I Die?" Ku Hye-sun's distress in a divorce suit and feud with her husband Ahn Jae-hyun. Koo's last lyrics, "I Am/None of Your Own," were alluded to Koo's desperate loneliness.

The song "Must I Die?" released at noon was mainly composed by Koo Hye-sun's voice, who sings brilliantly to the simple melody of the piano and guitar. Melody with a feeling of autumn, the clear voice of Ku Hye-sun, as the lyrics is embedded in the ears and heart of hers to show her supporters.

Ku Hye-sun is a singer-songwriter, actress, ambassador, and director who previously starred in Boys Over Flowers in 2009, Take Care of Us, Captain in 2012, Angel Eyes in 2014 and Blood in 2015. Ku has been dating Ahn Jae-hyun as they both starred in the drama, 'Blood.' They, later on, get married the next year they met until last August 18, 2019,

Ku posted an image of text messages between her husband discussing divorce to her Instagram as Ahn Jae-hyun never wanted to be with her anymore, but still, Ku Hye-sun wanted to preserve their marriage. Later on, the image was deleted. As it progresses, Ahn Jae-hyun has made a decision to file a divorce lawsuit to Ku Hye-sun.

Earlier this September, Ku Hye-sun has also admitted that she will continue to finish her college and said that she will be taking a break in the entertainment industry.