In the photo Jessica can be seen utterly proud of her sister, Krystal, for being on the same ice show as Kim Yu Na. To show her affection Jessica kisses Krystal on the cheek.
Krystal doesn't get embarrassed a bit by her sister's affection. She returns the favor by kissing Jessica on the cheek, as if to show off that this is completely normal in their relationship.
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Viewers who remembered the two sisters being affectionate on stage in front of other singers simply commented, "It's not even surprising anymore." They also said, "It's such a lovely sisterhood."