BASH

"All floors are equipped with ondol and maru as part of hanok," Alex explains to Trinity. 

Trinity lifts her chin to look at Alex. "What's ondol?" 

"Ondol is an underflooring heating system since Korea has a winter season," I answer her.

"Oh, so it's like a fireplace?" she asks. Her face lights up.

"Yeah, but the main source of the heat in this place is from the outside. There are horizontal flue pipes as a passageway of the heat beneath the flooring. ...