Come for the rating. Get in then get out.
If you are single and live in a shoebox you can do it but as you get older, get a girlfriend (or god forbid a Wife) and maybe have children it is not sustainable. You cannot rent a proper house for $45000 HKD a month. Schooling in Hong Kong is not cheap and can run 5-10K(or more depending on the school) per month per child
If you come for $45K, keep looking for something better as $45000 HKD a month is not sustainable long term.
In Hong Kong you need a housing/schooling package. What is your medical package, if you have one? (Gall Bladder= $80K)
Good Luck with your decision.
PS, You are not a manager fishing for the bottom line are you?