At the filming site of MBC's 'Dr. Jin,' Kim Jae Joong digests his role as the aegyo-filled, youngest son.

In MBC's weekend drama 'Dr. Jin,' Kim Jae Joong plays the role of Kim Kyung Tak, one who meets and fights a severe fate, receiving pain from his loved ones. Photos of actor Kim Jae Joong on set were revealed.

Kim Jae Joong began filming by painting over his arm injury with a brush and stretching his arm toward father Kim Eung Soo, who plays Kim Byung Hee, with a cute, aegyo expression. Kim Eung Soo looked at his son with a pitiful expression, as the two harmonized perfectly.

In addition, Kim Jae Joong used a sword prop to poke Kim Eung Soo's back, showing his cute playfulness on set and lifting the mood at the filming site.

According to a filming representative of 'Dr. Jin,' "Kim Jae Joong and Kim Eung Soo act as if they are real father and son, as the two possess a special relationship. Please support and love the Kim Eung Soo-Kim Jae Joong father-son couple until the end."