for youCombines 당신한테 (“to/for you”) with 는, marking “you” as the topic or point of comparison. 당신 can sound formal, intimate between spouses, or confrontational depending on context; 나한테는 is often more natural in ordinary conversation when addressing someone directly.
KO: 당신한테는 쉬운 일이겠지만, 저한테는 어려워요.
EN: It may be easy for you, but it's difficult for me.