Kunshu-sama ni Muneyake

Aria's world is thrown into chaos when Crown Prince Julius, the brilliant but insufferable royal she's sworn to protect as Captain of his Guard, announces her as his future bride. Stunned, Aria confronts him, and Julius offers a way out: if she can defeat him in any competition before the wedding in six months, he'll cancel the engagement. But with Julius' unmatched skills, winning won't be easy. Can Aria outsmart the talented prince and reclaim her life?

(Source: WEBTOONS)