Lee Kwang Soo surprised fans with his past model body.

The actor and 'Running Man' star featured as a guest on SBS Power FM's 'Cultwo Show', where Lee Kwang Soo expressed, "I used to be a model too. It's embarrassing for me when I say I used to be model. It's not because I think people should be embarrassed of being a model. I'm just embarrassed."

Fans were then shocked to see past photos of Lee Kwang Soo's model body, and he expressed, "It was 15 years ago. It doesn't look like that now."

In other news, Lee Kwang Soo's movie 'Inseparable Bros' releases on May 1. He and actress Lee Sun Bin also confirmed they were dating in December of last year.