A friend of mine committed suicide earlier this year.  Well I say friend, but more of an acquaintance.  The day before he did it, he showed no signs of it. He seemed happy.  He was looking forward to things.  His wife and child saw no signs that he was going to do it.  Then he texted a note just before jumping to his death (giving the police no time to respond).  There's not always signs.  Some people hide it.  Not everyone shows it.  I'm sure that's the case in China especially.  Remember that culture in the U.S. isn't the same as culture everywhere else.  

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