Kim Rae Won revealed the reason to why he gained weight.

A picture of him that made him look big was revealed on SBS "Healing Camp." He said, "it's only been a month and a half since I was done filming for the movie, and that was when I had the last filming in America. About a week ago, I really gained 15 kg."

Kim Rae Won said, "it's because I ate a lot of hamburgers. I made excuses during interviews. I first said that it's a problem in an actor doesn't know how to take care of his body while filming, but I said that I was done with the movie. I began to change that."

He said, "an actor should take care of himself, but more than my looks, I gained weight to show my inner beauty. I lost about 4kg to appear on "Healing Camp." I was a bit bloated when that picture was taken."