do I need to apply for honkong visa for transit for 2 hours at airport? If so, where should I apply?

I am a Nepalese citizen from Nepal currently in china as a student. I am in Anhui provience. I am planning to visit Singapore, malayasia and Thailand vie a local tour package from Guangzhou, so according to the package plan they are taking us vie Shenzhen to honkong and form hong kong to Singapore.