Seoul, South Korea (CNN)K-pop star Chen is getting married, a statement from the singer-songwriter's management company confirmed on Monday.
The star -- real name is Kim Jong-dae -- also appeared to confirm in the letter that his fiancée is pregnant.
"Chen met a very precious person and the two will get married," the agency said in its statement.
"The bride is not a celebrity and the wedding ceremony will be done privately," SM added.
In a handwritten letter released by SM Entertainment on Monday, Chen addressed his fans to confirm the news.
"I have a girlfriend whom I want to spend my life with," Chen wrote.
In the letter, Chen also appeared to confirm a pregnancy.
"I had concerns and worries about the impact of my decision but because I did not want to surprise my members, company and especially my fans who have been so proud of me with this news, I had been consulting with my company and members how to break this news as soon as possible.
"In this process, a blessing came to us," he wrote.
Chen's reference to a "blessing" is understood and reported to mean that he and his fiancée are expecting a baby.
"I'm a little bit baffled that I couldn't follow through my plans I've set up with my company and the members but this blessing gave me extra strength," Chen added.
"As I couldn't delay any more when and where to make this announcement, I've mustered my courage," he wrote.
However, some fans reacted angrily to the news, demanding that he leave the group.