This Let's Dance was so hilarious, we all should start learning this dance because...
But what may have puzzled viewers is the fact that he has an ace bandage wrapped around his shoulder before he even fell.
He earned that ace bandage while filming another scene in which his character played ice hockey.
According to his agency, Jellyfish Entertainment, the actor was treated right after he injured his shoulder ligament and he returned to the set immediately after treatment. He wanted to continue shooting is scene.
"He has a shoulder guard on because he hurt his ligament, but he removes it during shoots," said a Jellyfish Entertainment representative. "He only keeps it on during breaks or when he's looking over his script."
Whether the injury he sustains working out was originally part of the script or was added after he injured himself, it is convenient as it allows him to wear a cast and rest his arm.
The naturally athletic star learned to play ice hockey especially for his "High School King of Manners" role. He took professional ice hockey lessons for two months, practicing with the Kwangwoon University hockey team and star hockey player Ahn Geun Young.
"I want to be an actor who fulfills the role assigned to me," said Seo. "If the character requires me to put on weight and look ugly, I will do the background work in order to immerse myself in that role."
Still, even with two months practice, hockey can be a rough game and simply wearing the heavy uniform can be exhausting. His character is supposed to be an ice hockey star and perhaps the best athlete on the team.