아버지가돌아가시고외로워하는새엄마혜진을위해여자친구유미와함께여행을떠나기로하는성진.                                  바다도보고펜션에서고기도구워먹고신나게놀다펜션노래방에서노래를부르고노는데순간정전이일어나며혜진과유미의몸이바뀌고만다.                                  유미와혜진은금방괜찮아질거라며서로를위안하고성진에게는비밀로하기로한다.                                  성진은혜진의영혼이들어간유미에게계속치근적대며스킵십을하지만유미의몸에들어간혜진은불편하기만하다.그런둘을보며혜진의몸에들어간철없는유미는성진에게치근덕대고성진은그런새엄마의모습에당황스러워하는데..                                  혜진과유미는과연자신의몸으로돌아올수있을까