I arrived at LA Airport, but the SIM card I purchased in Korea doesn't work. Although it is a bit inconvenient, there is no problem in getting to the Korean guest house that I have reserved in advance by public transportation. Here, I summarize public transportation methods to get from LAX to Koreatown or downtown. LA has a relatively developed public transportation network, so it is not difficult to take public transportation to downtown. I hope you all can refer to it too.