One day on a hot summer day, Suyeon calls an AS engineer because her air conditioner breaks down while exercising at home. But there I meet my ex-boyfriend. After a long time in reunion, they fall into the old thoughts and immediately go into the room and make love. Meanwhile, Eun-jung goes out of the house to dump her husband's luggage. Tae-hwan, a neighbor he met on the road accidentally, takes off Eun-jung's skirt, and they share a hot kiss at Eun-jung's house.

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