During their Save Me Save You promotion.

Yeoruem : Seola unnie can I know why is your hand is on my thigh.

Seola : oh sorry I thought it was a pillow 

Yeoruem : but your hand is still on my thigh

Seola : oh sorry I thought it was my thigh

Yeoruem look at Seola weirdly.

Yeoreum : that pretty weird of you..

Seola : sorry I accidentally put my hand on your thigh..

Yeoruem : well I think putting your hand on somebody's thigh while looking at it is not consider as accident

Seola blush.