Kim Yunseok mentions Yuchun in his interview with Newsen
In order to maintain the outlook of a sailor, there was only one way. We followed the living pattern of a real sailor. We had dinner accompanied by alcohol. But what was worse, we lay out at the quayside and drank alcohol. At that time, it was just sailor Park Yuchun. Park Yuchun who drank together with us gained weight and became plump. So, not long ago in Busan when we went to the stage greeting together I said this to him, "So this is how you originally look like?"