Dan-Han had been a bit surprised when the Kim second master agreed to being the father of the missing child. He had posed his question to taste the waters, but who knew the man would willingly admit it.
Strange.
After watching the footage from the airport several times and analysing all facts regarding the issue, he had a hunch Ms Soo-min might have been romantically involved with the man and had gotten pregnant with his child. And from the way things had turned out the man must have been ashamed and displeased by the turn out of event, and had tried to settle things by locking her up till her pregnancy came to full term, so he'd take the baby and probably get rid of her. But somehow, she must had escaped hence the scene at the airport.