When to use rival in Korean
Korean: 라이벌[ ra-i-beol ]

When to use it
A rival (라이벌) is a person or team that competes with you and also wants to win. In school, a rival can be a classmate who studies hard like you or another school you often compete against. We use this word when two people or groups try to do better than each other.
Example sentences
우리 반에서 민수는 내 라이벌이야.
In our class, Minsu is my rival.
옆 학교는 우리 학교의 라이벌이야.
The school next to us is our school's rival.
나는 수학 시험에서 라이벌을 이기고 싶어.
I want to beat my rival on the math test.
체육대회에서 우리 팀은 라이벌 팀을 만났어.
At the sports day, our team met our rival team.
친구가 "너랑 소라는 라이벌이야?"라고 물었어.
My friend asked, "Are you and Sora rivals?"
동생은 바둑 대회에서 강한 라이벌을 만났어.
My younger sibling met a strong rival at the baduk tournament.