Just yoona being yoona, bought something that remind her of that person...I remember yoona bought something for hyori & her husband too before...she's in japan & she saw something that remind her of hyori & sangsoon so she just bought it, a couple look clothing for the sweet couple.....btw, park jeongmin was a good person too, giving yoona a letter where she's never receive from any of her co-star.....to think that yoona used to write a letter & giving it to all actor & staff in the past (for instance in yamd), finally she's the one who receive it, for sure it's really make her happy....thank you actor park jeongmin.