Just to bring a a little fact and context to the unpleasant subject of youth suicide.
Hong Kong rate does not feature in the top 70 countries worldwide but the USA, Australia and New Zealand are unfortunately high on this list with the rate in the US being approximately 6 times that of Hong Kong. According to the UK Guardian 7% of teenagers in the UK between 15 and 19 have attempted suicide - if correct a truly horrible statistic.
I have had several children at schools in HK for the past 25 years (and still) and have only ever been aware one suicide.