(CNN) Fans of K-pop superstar Kim Jong-hyun are expressing their grief at the loss of the 27-year-old singer who died Monday after committing suicide at a studio apartment in the Gangnam district of Seoul. Police said Kim's sister told them that the singer sent her text messages such as "Final farewell" and "I've had difficulties" before his death. Kim Jong-hyun, better known by the stage name Jonghyun, was found unconscious at a residence hotel in Seoul and was later pronounced dead at a nearby hospital, Seoul police said.  SHINee lead singer, who died in hospital on Monday, said he felt ‘broken from inside’ in note made public day after his death 
 
 A harrowing note left by the K-pop singer Kim Jong-hyun, who has died in a suspected suicide, has highlighted the pressures facing young people in South Korea’s intensely competitive entertainment industry. In Seoul, fans paid their respects at Asan Hospital Tuesday, ahead of a funeral which the family has requested to be held "as quietly as possible," according to SM Entertainment. Kim Jong-hyun, better known by the stage name Jonghyun, was found unconscious at a residence hotel in Seoul... (Associated Press) 
 
 FILE - In this Oct. 4, 2016, file photo, Kim Jong-hyun, a member of South Korean K-pop group SHINee, poses for the media before a showcase for the group's album "1 of 1" in Seoul, South Korea.
– A K-pop superstar in South Korea whose bandmates said "loved music more than anyone" died Monday in what appears to be a suicide, the BBC reports. Police say Jonghyun (full name Kim Jong-hyun), said to be in his late 20s, was found unconscious in a Seoul residence hotel and taken to a hospital, where he was pronounced dead, per the AP. While police haven't confirmed the death of the lead singer of SHINee was a suicide, Yonhap reports that investigators discovered incinerated coal briquettes in a frying pan in Kim's room, suggesting he died from inhaling the carbon monoxide that's emitted when coal is burned. Police ended up there after his sister called 911, worried Kim might be killing himself based on texts he'd sent her, per AFP. "This is my last farewell," one of the texts reportedly said. Another: "Please let me go. Tell me I did well." Per a separate Yonhap report, a close friend of Kim's posted on Instagram what she says was his suicide note; she says Kim's family was OK with her doing so. "I'm broken from the inside," Kim wrote. "The depression that has slowly nibbled me away has now devoured me, and I couldn't overcome it. … No one alive is more tormented nor weaker than myself." He also noted being famous likely wasn't for him, asking himself: "Why did I choose that?" The AP reports South Korea has one of the highest suicide rates in the world. The Guardian adds his note underscores the pressures of being a young entertainer in South Korea. Police say Kim's family doesn't want an autopsy, and his management company notes the family wants his funeral to be held "as quietly as possible," per CNN.