OMG! Love going down memory lane!
Actually, GS tickled SH's ears 3 times: The first time at teh ANJELL photoshoot, the second time in the "bed scene," and the 3rd time in the BTS when GS blew into SH's ear.
DID SH ACTUALLY SAY YES WHEN GS ASKED HER IF HE LIKED HER? I THOUGHT HE WAS MAKING IT UP WHEN HE WAS SCREAMING "PSH CHU AI EH"
I had the same thought too about where SH was sitting at the end of the concert. I was also thinking that the space between HK and GS was for SH but she sat with YH!! Actaully,come to think of it, YH was always beside her a lot that nite!