The first stage of the interview was the phone call. Then I had an online interview with one of the HRs, which was originally an on-site interview. I applied for the position in HK, but refer directed to the one in Korea. So for the next interview, there were two sessions: one from HK and the other one from Korea. For the HK session, the interviewer was very nice that I truly enjoyed it. There were no technical questions yet. For the Korean session, there were some technical questions with some tasks given, which I had to finish and explain the process of how I came up with the solutions.