I think he said he has no GF from since december 2009 ? Sorry I don't follow his news very close... someone confirm?
His mom is concern about her only son, only child's marriage. (he's 23 afterall....) To go check the fortune teller if she thinks there's a girl she wants him to consider or if he's going out with is not unusual if she has a habit to see fortunetellers... its a kind of culture in some asian countries ... she may have checked other girls that he has gone out with before.
All the idols wear alot of rings... its hard to guess what and what until they choose to FLASH it to us haha.
I think SH took the photo secretly and her 'must hide' probably meant, cannot let him know about it?
I don't think too much of that because it felt like she's pranking him.
Actually in the BTS, they seemed more like fooling around and playing than really flirting. Maybe some scenes they got too close and starts to confuse the viewers.. But I think its the result of having to be in each others company for 24/7 x 60days.. The group became so close its possible the usual gender difference proprieties got blurred.
KS has the tease devil in him... he found out about SH behind the ear sensitiveness (probably from EH Cf times) and likes to tease her. They know there are cameras on them and there are people eyes on them.
But KS probably can't help himself. He's like a kid who likes to see a girl squirm after pulling a prank.... which makes me think he does like her somehow... there's some truth in the "boys always like to prank on girls they fancy" saying...
As much as we fans can spazz, I think they have the good sense not to behave out of bounds in front of the whole crew

Won't know about it when they're out on their own though...