철천지원in English:a deep-seated grudge or resentment

Examples
with 철천지원.

• 그는 철천지원이 있어서 그를 용서할 수 없다.geuneun cheolcheonjiwon-i isseoseo geureul yongseohal su eopda.He has a deep-seated grudge, so he cannot forgive him.