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According to his label NH EMG, "Lim Chang Jung's wife gave birth to a baby boy weighing 3kgs on May 10 at 11:45 AM KST... Lim Chang Jung is with her in the hospital, and both the mother and baby are healthy. Please congratulate them." 

Lim Chang Jung already has 3 sons and is now the father of 4 sons total, and tied the knot with his current wife this past January. Congratulations to the family!