Princess Lihua, sister to Wu's ruler Sun Quan, enters the political alliance when Liu Bei seeks refuge in Wu territory. During his stay, a romance develops between Liu Bei and Lihua. Sun Quan initially opposes but ultimately allows their relationship. Lihua actively supports the alliance against their common enemy Cao Cao of Wei, participating directly in strategic preparations for the pivotal Battle of Red Cliffs alongside key figures. Her presence and actions are intrinsically linked to the diplomatic and military efforts uniting Wu and Liu Bei’s forces against Cao Cao’s threat, centering her role on this critical event within the narrative adaptation.