SNSD Seohyun snap a photo with actor Kim Youngmin

That would be on October 7 at 9:30 PM KST and to invite their fans, here's Seohyun together with one of her cast members, the actor named Kim Youngmin.

"With Youngmin sunbaenim who is so cool😎Guess what our relationship is..?
#ChaJooeun #KimJaewookJTBC Wednesday and Thursday drama 
#PrivateLives, first broadcast on October 7 at 9:30 PM🖤"

If he is familiar to you, you may have see Kim Youngmin on 'Crash Landing on You' and on the 'World of the Married'.