Those kids 
earlier jang j came up onto the bed then i took away the ladder and i told chaeyoung-unnie "i locked jang j on the 2nd floor!!" and only then did j go "ah what's this why.?!!" and i kept laughing
and she said "i have a schedule to go to tomorrow, so i said okay okay and returned it back to the original way again
but i went to get something from my bed and she thought i was gonna remove the ladder was again so she cautiously said "yah don't remove it~~!
i said "what kind of ladder thief do you think i am" and she said "you go quickly wash up~~!!!" she did this hahaha LOL
the killing point is careful jang j's gaze when she thought i was gonna remove the ladder again when i went to get smth from my bed
haha funny right