Umm im looking for this manhwa where mc rein to a novel as a water mage the bestfriend of ...

Umm im looking for this manhwa where mc rein to a novel as a water mage the bestfriend of the mc in the novel but she accidentally stole the ml first night and that guy is actually the ml he is a fire mage the novel supposed fl is dating the prince but their relationship is rocky... soryy if my explanation is off i just think everyone knows it her name i think is rai something