Contracted boyfriend

Due to the circumstances, Ariana accepted to be engaged to an unknown person but it turns out that her fiance is her enemy in school. She accepted a contract with Zach and they fell in love with each other. Fate came between them and they parted ways but found themselves after some year but will Ariana still love Zach again when she find out that he lost all his memory of her? Find out more of the fate of these two love birds.