"볼에 바람넣은 사진" == 볼에 바람(을) 넣은 사진 == 볼(cheeks)에 바람(air, wind)을 넣은(put in; fill) 사진(photo)
=> photos with puffed up [ballooned] cheeks
"볼에 바람 넣은 사진 제일 좋아" => I like photos with puffed up cheeks the best.
2016年7月13日
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Blow and keep air in your mouth. Its the Action Making your cheek like ballon. Your friend likes a photo what you are posing this action.