Deciding to calm herself, Hyo-jeong heeds an old friend, Seon-hwa's advice to take up yoga class for a week.

Her yoga colleagues include the jolly but demented In-soon, the failed actress Yeon-joo, the troubled mother Yoo-kyeong, and the quiet Bo-ra.

Nevertheless, they continue to undergo intensive training and even start to bicker with each other as they attempt to achieve Kundalini (the coiled "serpentine" energy) as promised by Na-ni.

Throughout the week, the women start to break the rules: on the third day, Yoo-kyeong bathes less than an hour after training, and In-soon eats a strangely prepared dinner.

Stating that she cannot continue the act anymore, Na-ni succumbs to her wounds inflicted by Mi-hee while Hyo-jeong escapes.

After the subway experiences a brief power failure, Hyo-Jeong shocks in terror when all the people disappear, leaving only posters depicting Mi-hee hanging on the walls.