On the May 30th episode of SBS' 'Same Bed, Different Dreams 2', Lim Chang Jung and his 5 kids are seen going to the theme park. While the family was busy preparing for their field trip day, their third son Lim Joon Ho wasn't spotted in the house. 

Lim Chang Jung's wife Seo Ha Yan then revealed Lim Joon Ho is staying with his birth mother, who is Lim Chang Jung's ex-wife. She said, "I asked Joon Ho when does he want to live with his older brothers. He then said 'who would protect mommy if I move out too?' He said he'd like to come later. I knew exactly what he meant as a mother, so I told him to do what he wanted to do." 

She was also seen having a phone call with Joon Ho's maternal grandmother to arrange Joon Ho's pickup. She added that when their second son was sick, she met with their birth mother but both amicably thanked each other for raising the kids well as mothers. 

Meanwhile, Lim Chang Jung's first three sons are from his ex-wife and the last two sons are from his current wife Seo Ha Yan. Joon Ho was 4 years old when Lim Chang Jung divorced, so he initially stayed with his birth mother.