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이 마음에

… appeals to

→ 이
phrase Uncommon #7,605
… appeals to Usually appears in 마음에 들다 (to like something) or 마음에 안 들다 (not to like something). The 이 marks the thing being liked; the person who likes it is understood or indicated by context.
KO: 그 색이 마음에 들어요.
EN: I like that color.