If you want to watch without translation, www.tvboza.com uploads most kdramas including this one within several hours of airing in Korea.

Summary mentions "Romance of Three Kingdoms" as model of this story. This is wrong. It is "Chu-Han Contention Chronicles". The Korean title is "Salarymen: Chu-Han Contention Chronicles". The main characters Yoo Bang (Chinese: Liu Bang) and Hang Woo (Chinese: Xiang Yu) are the two kings who will fight to the end. The two sides of Chinese chess are called Chu and Han (western chess:Black and white). Their story is so well known Korean viewers can predict what will happen from names of the characters alone. But most American viewers may miss many subtle points.

Ku Hye Sun is a singer, composer, actress, award-winning movie director, writer, illustrator of children's books, painter, etc.... So we know she can do almost everything well, but so far I am a little disappointed at her acting here. No depth, not believable...