Service agreement bond

Hello sir, I am working as a intern in a private concern till date. It has a service commitment period of 18 months once after appointing as a Full Time Employee and have to pay 1Lakh if i re-leave before end of 18 months . But I am not yet signed bond for full time employee. But I signed for agreeing for internship offer. They stated in offer mail like this... " Offer Terms/Service Commitment: · We require that you agree to Sign Service commitment bond for period of 18 months from confirmation as full time Employee (1st day as full time Employee counts as day 1 of Service commitment period) to be associated with <Company Name> as condition of accepting this INTERN offer. This helps to secure<Company Name>’s interest in providing all required trainings, development for what is considered as reasonable period · In case of unfortunate event of leaving <Company Name> before this service commitment period ends, you are required to reimburse <Company Name> amount Rs. 1,00,000 (One Lakh only) " I am in doubtful state if I re-leave from now whether I have to pay money or not?