The Colorectal Surgery is a sub-division of General Surgery, where the surgeons perform diagnosis and surgical treatment for various diseases of the large intestine and anus, quicklyexpanding recently. Professor Yang Chun-Seok is in charge of this department, who specializes in treating colon and rectal cancer. He attempts to find the most suitable treatment method for patients by performing laparotomy and laparoscopic procedures. In rectal and anal cancer, preoperative chemotherapy used to increase the preservation rate of the anus. Also, we are in charge of treating benign diseases of the large intestine such as colon diverticulum, inflammatory colon diseases (Crohn's disease, ulcerative colitis), and various anal diseases.