her image on broadcast is both mature and innocent
she never did anything controversial or was never in any dating rumors!
she's even known for being a motaesolo (never dated), I wish that she could date a bit hahahaha
lastly, here's an anecdote:
Yoona saw Seohyun listening to her MP3 and wanted to know what she was listening
it turned out to be an OST from Keroroㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋㅋ
original post: here