Kim Se Jung adorably talked about the pains of sleeping in bunk beds on the June 30 airing of JTBC's 'Old House, New House.'  She has a second-level bed.

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She revealed, "There are times when the members finish their schedules at different times, but in that case, I feel sorry if I wake up the sleeping members because of the creaking, so there was a time I didn't even go up to the second bed but slept on the floor."

She also revealed that once she was taking things up to her bed and ended up hitting Mina, who was sleeping on the first-level bed, with one of the objects.