Reject exchange program

Annual exchange program is coming in my company.I am selected to join this program who will go to HongKong for one week.But I have given up the opportunity.That reason is that I will have to sign one agreement which say that I need pay four thousand yuan once I quit within one year.When our HR told me about that, I said I was unwilling going to.I feel the agreement is unfair to me.What my thought is that since I has been selected to join the program, I should be considered to be appropriate.There is no need sign it entirely and it mean that company don't trust me.That why I say no.Actually I intend to find another job.