Osora

Prince Osora is destined to rule over the Calaveras Kingdom in a life planned out by his family since birth, when his father presented him to the kingdom as male. However, the magic-wielding race called Sergos has a different plan for Osora: to use him as collateral in war with the humans. Bound by what others force him to be and trapped in a love triangle between a promised fiancée and his childhood best friend, Osora must recreate his own story.

(Source: Webtoon)