This was a classic story about a song of ice and fire. The male lead was usually called the " ice cube " or " ice man ", and the female lead was usually called the " flame " or " fire woman ". In this plot, the male protagonist tried to open the ice-sealed cave of the female protagonist, but found that her cave had been frozen and could not be opened at all. The male protagonist would usually use a sword to break the ice, but the female protagonist would usually use a sword to stab the male protagonist in the neck to prove her determination and loyalty. This plot was usually used to show the emotional conflict between the male and female leads, as well as the power struggle and loyalty test between them. This plot was often used to show the hero's bravery and the heroine's determination and courage.