I don't know if you know this but for men they can feel the pleasure reach up all the way to their spine as the semen is being created in the balls, so maybe he felt it in his spine, given that he's inexperienced and this was probably his first time touching himself. I might be wrong but I'm just giving the biological explanation
Of course you are right. And your biological explanation is right. I was just talking about his portrayal that is all. If you have seen most manhwas you will see a pattern where men masturbating usually grab the wall to support themselves as they climax while either tilting their heads back. But this one held his back instead of the wall. So I was laughing at the distinction. Any other guy would have fallen backwards as his knees give out from pleasure. But not our Guwon (≧∀≦)
Looking back at it, it almost looks like he broke his back as he was gooning I get why you commented about it
Isn't anyone going to comment about how he jizzes while supporting his own back??this part cracked me up no end. While his normal pals bend over he bends backwards and nearly falls(≧∀≦)