They were all in SNSD's Hello Baby. But if you are talking about Why she wasn't in it that much its probably because of her schedule.
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Yes, Jessica Jung from SNSD is single.
Jung, Jessica Sooyeon
No. Donghae and Jessica were and still are friends.
No
It is rumored to be SNSD's Jessica, who was known for being in a relationship with SJ's Donghae.