Singer Byul gave birth to a baby boy Wednesday at a hospital in Seoul.
QUAN Entertainment, the agency of Byul and her husband Haha, said both mother and child are healthy and well.
The baby is the second son of the couple.
"It is a different kind of happiness from the birth of our first son," Haha said in a statement.
"My wife took so much pain. We'll raise him well."
"Congratulations Dream (their first son's name) on becoming an older brother!" Byul wrote in October 2016 on Instagram, a few weeks after she revealed her second pregnancy.
Haha and Byul tied the knot in November 2012 and had their first son in July 2013.