How traumatizing for those children. I can't even imagine.
I find it odd that he went to work as usual next morning (although left later after telling his boss his wife was missing IIRC). If I was worried about my wife and thought 24 hours had to pass before contacting police, I would not be showing up for work...I'd be looking, making phone calls to friends and family, enlisting help to search, etc. This casts some suspicion on her husband IMO. Unless she "disappeared" before like this with the kids because they'd had an argument or something.
I can't entirely agree with this. The impression that I get is that Mr. Woo is very committed to his work, perhaps too much so. I feel like he may have been so focused on his job that he failed to be an involved and attentive partner to his wife and missed warning signs of her mental wellbeing. Even after Christine and the kids went missing....maybe he didn't know what to do except work.
My own husband went straight to work after our son was born prematurely and was fighting for his life. I was furious with him at the time! I realize now though that he was in shock, trying to do "normal" things to cope and avoid the seriousness of reality.
Not excusing Mr. Woo. He should have been there. I bet he either knows that now, or will soon.