I would encourage you to NEVER lie on your cv or a company application form you fill in (which most companies will ask you to complete). More often than not, that form will require you to sign against a statement confirming that the information given is correct and that any misinterpretation of facts could be cause for dismissal.
If the job doesn't pay what you are worth (bearing in mind there's a difference between what you are worth and what your lifestyle demands you earn - no judgement being made here!) then keep looking and keep yourself free for interviews by not taking on another job which you're not going to be truly engaged in anyway. The worst thing you can do is hop around and even worse, leave things out of your employment history. Hong Kong is a small place, and industries are smaller still.