It's nice to see SNSD wearing some normal clothing in Japan, as I would expect them to wear bandanas with flopping tentacle wieners dangling around to match the high school outfits that are wearing. SNSD, you need to capture the otaku market in Japan, and I see no better way to do it than this.
The MV is standard, but it works, as the MV follows a coherent storyline. Seohyun brings one of the gal pals with her to a cafe or some shit and find that their friend's boyfriend is a two-timing dildo-licking-
Meanwhile, Taeyeon has plans to burn the boyfriend's dick off. Just look at her laughing maniacally, thinking of the joy she'll have while she watches a dude's dick turn into a burnt-up-useless tool.
More importantly, Yoona is ruining my bias list.
So in the end, the girls teach the man a lesson to not fuck around with other girls while dating one of their friends. They danced to a fairly good song while wearing some nice outfits. I'm assuming the girls wanted to let this man enjoy something good before they killed him, because if they truly had wished to torture them, they would have performed IGAB. Maybe if SNSD had performed IGAB, the man would have taken the torch from Taeyeon and burnt his ears off and eyes out. Who knows, but at least My Oh My was a decent song to listen to before he died.
Thanks to comekpop for the Seohyun and Taeyeon gifs and yoonyvl for the Yoona gifs.