South Korean K-Pop boy band SHINee’s lead singer Jonghyun, who died in an apparent suicide at the age of 27, left a final note before ending his life over his alleged depression. Jonghyun’s close friend, musician Nain9, released a suicide note on her Instagram account Tuesday.

“I am broken from inside. The depression that gnawed on me slowly has finally engulfed me entirely,” the letter said, adding he “couldn’t defeat it anymore.”

“I was so alone,” he went on. “The act of ending is difficult. I’ve lived until now because of that difficulty.”

“Please tell me I did a good job,” he said, ending the note with: “You’ve worked hard. You’ve really gone through a lot. Goodbye.”

Jonghyun, whose full name is Kim Jong-hyun, was found unconscious in a hotel room in the South Korean capital Seoul. Jonghyun's cause of death is said to be carbon monoxide poisoning which could have been caused by breathing in fumes from the lit coal briquettes. Police said the singer was found with a burning coal briquette nearby.

His band broke silence over his death posting a message on their social media pages. The official SHINee Twitter account shared a picture of Jonghyun performing on stage, along with a note written in Korean. The translation of the message reads: "Jonghyun, who loved music more than anyone, who enjoyed the stage, who communicated with fans through music, the best artist. Forever, he will be remembered."

Fans of K-pop superstar were heartbroken following the news of his death. 

"He deserves to be remembered for what a great person he was, and what an inspiration he was to so many people," U.S. fan Kylie Grant, 20, who traveled to Dallas to watch SHINee in March. "To Jonghyun, I'd like to say, thank you for all the happiness you have given me and so many others. You worked hard, and you'll be remembered forever."

According to reports, Jonghyun's family requested the funeral be held "as quietly as possible," according to SM Entertainment.

"He was full of emotions and a sensitive person. He must have had lots of hardships but hid them and didn't show them to others, that must have been the toughest part for him," Jung Min-kyung, who joined grieving fans in Seoul, said according to CNN.

Jonghyun began his career in 2008 and participated in S.M. Entertainment's project group S.M. The Ballad. Jonghyun debuted as a solo artist on Jan. 12, 2015, with his first EP, titled "Base." On May 24, 2016, Jonghyun released his first studio album, "She Is," followed by his second compilation album, "Story Op.2" on April 24, 2017. In 2016, he won the Golden Disk Awards for "Base."