The more I watch of Raymond's character backstory, I am sure his character is a carbon copy of Shim Gun Wook in Bad Guy (K-Drama). The fact that he was also taken in by the family and then revealed as not the real son and getting injured and leaving a scar (except Raymond got cut by the neck and the K-drama version had the boy getting a big scar on the lower part of his back) and then growing up to exact his revenge on the family is very much like Shim Gun Wook (Kim Nam Gil's character). The Korean version came earlier like in 2010, the evil family also was rich and had an evil mother and all.
I guess the differences would be the time setting, location, and most importantly SGW's character wasn't using the people that actually mattered to him or taking advantage of innocent people like Raymond's character seem to do. Raymond's character seem to plot and scheme and use innocent people to exact his revenge on the Ko family, even to the point of using Tsui Sum.