Are there any tips for foreigners looking for jobs in Seoul?

Hello! I'm a foreigner who will be moving to Seoul soon. My wife will be working at an international school in Seoul starting in August 2026. I don't have a job yet, so I need to find work in Seoul, and I'm wondering how best to prepare. I have a bachelor's degree in business administration from the United States and have experience as a substitute teacher at an international school. I am considering getting a TEFL certification or a teaching license online. Of course, for now, we're okay financially with my wife's income, but I also want to contribute to our household. Has anyone been in a similar situation? I would really appreciate any tips or experiences from foreigners looking for jobs in Seoul! I would like to find a job in areas like Gangnam or Itaewon in Seoul. Any advice would be greatly appreciated!