On October 24 episode of SBS POWER FM's radio show 'Choi Hwa-jeong's Power Time', Kim Yun-jin and So Jisub made a guest appearance.

Kim Yun-jin laughed and said, "Jisub is so different before and after the shooting begins. I met So Jisub for the first time about six months ago. Around then, I met up with him for the read-through a lot. Then, So Jisub kicked off filming before me. I was surprised when I saw him on site."
She continued, "It was because his face was half the size of the face that I saw months ago. I could tell that he was a very strict person when it came to managing and taking care of himself."
So Jisub responded, "There's no secret to it though. I just try to exercise regularly. There is nothing that I routinely do in particular, but I do go to bed before 12 in the morning if I have a shooting the next day."

He went on, "Oh! About self-discipline... I get tempted lots, actually. I love eating, and it's hard to resist the temptation of good food. So, I gain much weight. What I do is that, I eat healthy food the next day. I return to looking okay-ish when I do that.", then laughed.
Kim Yun-jin shared, "Yeah well, you can really check out So Ganji (swag) like his nickname in our film. I would say that 'Confession' is one of the top three projects that he looks the most good-looking and cool in."

(Credit= SBS POWER FM Choi Hwa-jeong's Power Time)
(SBS Star)