Rewriting My Husband’s Tragic Ending (2021)

Blurb:
As the bastard child of the Anzak king, Alexia knew she was destined for very little. The Book of Wolves foretold her destiny as a side character, from her impoverished childhood to her brutal death at the hands of the enemy prince, Tervion. But when Alexia is sent to assassinate him, the story changes. Now she’s engaged to him as part of the peace treaty between their two countries. In the face of mortal danger and abandoned by a loveless father in enemy lands, Alexia must decide where her loyalties lie and whose life matters most.

Source: www.anisearch.com/manga/64413