We've linked you to etnews.cr.kr and its translated report regarding employee theft of trade secrets.
They note: "Out of the 189 cases the national agency investigated at this time, 113 were about former employees stealing technologies. Current employees were involved in 33 of them and partner firms’ personnel in 26. To sum up, 91% of the total cases had to do with staff members handling technologies themselves. According to the center, the number of tech leaks caused by disgruntled employees is rising these days, too."