When asked to comment on the acting skills of each JYJ member including himself, Kim Jaejoong maintained his modesty and stated, "I watched Kim Junsu's musical as well as all the dramas Park Yoochun appeared in and I concluded that I'm the worst at acting" and added, "We don't really talk about each other's acting."
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Also, when Kim Jaejoong was asked about what kind of advice Park Yoochun gave him after his own experience of filming a historical drama, Kim Jaejoong replied, "He didn't say anything specific about historical dramas but just said, 'you must be exhausted.' Other JYJ members watch my drama every week and give me positive feedback to show their support."
In "Time Slip Dr. Jin", Kim Jaejoong plays the character named, Kim Kyung Tak who has special talents in martial arts and horse riding. Kim Jaejoong also added, "I filmed a lot of scenes riding horses so I'm very attached to them now. When it's cold, the temperature of the horse warms me up and when it's hot, riding the horse cools me down."
Regarding the relationship between Kim Kyung Tak and Hong Young Hwee's in the drama compared to the real life relationship between Kim Jaejoong and Jin Yi Han, Kim Jaejoong explained, "We knew each other before we began filming this drama. Even though he's 8 years older than I am, Jin Yi Han treats me like a friend and makes me feel very comfortable. I think he's paying a lot more attention to me now that we have a lot of scenes together in the drama" and began to laugh.