after watching season 3 i would say i admire woo jin more than kang doju. woo jin is innocent character who tends to fllow kim sabu as a father where as kang doju want to lead with strict approch until woo jin made him realise that sometime exceptions are required. and i think trauma centre was built in woo jin and cha eunjae era so they are more related. despite his hand injury i think woo jin would have been a better leader of trauma centre because all characters follow more of him as a lead. kang doju is harsh character. so i like s2 and s3 more than s1. s4 should be more related to woo jin than kang doju because woo jin work there for 3 years to make doldam and trauma centre reality.