Mi-yeong (played bySong Eun-jin) is a woman who likes having sex with her boyfriend. Somewhat awkwardly, her boyfriend is actually a friend of Mi-yeong's younger sister Mi-hye (played by Joo Yeon-seo). Even more awkwardly, it turns out that Mi-hye kind of sort of made one of those "if we're still single by such and such date let's get hitched" promises with said boyfriend. Well, there's no non-awkward way of resolving a situation like that.
"The Sisters' Room" is first and foremost, a mildly erotic comedy. There are sex scenes- reasonably extended ones. Director Han Dong-ho likes him some breasts and isn't so big on penetration. You know, I can live with that. It's not like the men here are schlubs or anything. Jeong Neom-chyeo and Kim Do-jin both have reasonably attractive bodies and let's be totally honest here. We'd all much rather be watching rock hard abs instead of dongs. And Song Eun-jin has some pretty impressive breasts, just to make that much clear........