Kang Dae-Ho, a naughty boy who gets used to his ever lowest academic records. Ko Eun-Bi, a prim-looking girl and model student. These two get to lose consciousness due to unidentified lightening on a stormy day. Then a great surprising thing happens : their bodies are exchanged. Both of them who still don't know it are kicked out of their home and came to live in counterpart's house according to changed bodies. Their changed attitudes make those who around them surprised. When Dae-Ho stands on 5th of the school in mid-term exam, he gets suspicion from teachers. Thus he goes up for exam again while Eun-Bi's result is jumping down. Thus her parents prepare for emigration worrying about changed Eun-Bi. As a result of re-exam, teachers remove suspicion on Dae-Ho but the teacher who charged in student affairs announces that long waited festival isn't going to be open. Meanwhile Eun-Bi, who came to know the preparation of emigration secretly to her, prepares a rock concert in secret to the teacher. The festival atmosphere is getting ripe and misunderstandings and troubles are settled down. When the harmony is achieved, heavy rain pours down flashing unusual lightening like the other day. Then the two get back their positions.