Can u solve this problem?

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An impoverished student approached a law professor and expressed his desire to learn law.The professor agreed.The deal was that the student would pay the professor the entire fees when he wins his first case. when the course was over the professor started demanding his fees,then the student would remind him of the deal.The professor filed a civil suit to recover fees.His argument was that his case is for the payment of fees.So if he wins he can recover the fees,if he loses the deal is to be implemented.Either way,he is to be paid.But the student's argument was that his case is for non-payment of fees.So if he wins the case he need not pay.If he loses the case ,as per the deal, he need not pay.Will the professor get his fees? What's your opinion?