On January 20, Cool Company announced, "Kim Won Joon and his wife gained a beautiful daughter weighing 3.27kg at 9 p.m. on the 19th. She gave birth through natural childbirth. The mother and the baby are both healthy."

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Kim Won Joon personally shared, "I'm happy and grateful to deliver the happiest news to my fans, who always give me their support and encouragement. As a father of one child, I want to show more responsible sides of me, and I will work hard to repay fans' love with active promotions and good music."

Congratulations to Kim Won Joon's family!