I consider that the whole process was too long. Many persons were involved (local people & Korean people). Besides that, the HR process was quite complicated and burocratic. Don't worry if you are not contacted within 1 week after the previous interview.
Regarding the stages, the interview was performed as follows: 1) HR Analyst, 2) Manager (Direct boss), 3) Head of Division, 4) Korean Dispatcher, 5) President. In the case of the last stage, the President required to prepare a short presentation related to Samsung Mobile products and then that presentation was sent by email. After that, HR team will contact you to inform regarding the result of the process.