It's was the end of they're very busy day of practice. After the departure of Exo-M in China Exo-K practiced day and night for they're concert and performances. They're vocals and rapping are good but they still need to work on they're dance. In the middle of Growl dance a sharp pain from his wait kicked Kai making stumble and going into Suho.

"Kai what's wrong? Suho asked in his mother tone.

" Nothing. I'm just tired. That's all. "

" Fine them. We will practice this one more time then we go home. "

After the music ended the others prepared to leave. 

" Go without me ", Kai said." I forget something in another room."

"Ok" said Suho. "We will wait you at the car. Hurry up"

"Sure and thank you hyung."

 After he made sure that the others left and will not return Kai collapsed on his knees, his forehead touching the floor  and with a hand he pressed his hurting are. He was in so much pain that he didn't hear the door opening and neither people rushing to his side.

"Jongin-ah", a familiar voice said touching his shoulder making him flinch slightly.

He lifted his head to see his best friend, Taemin beside him and the others Shinee members in front of him looking worried at him. 

"Jongin are you ok?"

"I'm fine Taemin", he answered rising from the floor and wincing. 

"Bull", Minho said. "We can see from far away that you are hurting."

"Is your waist acting up again?