Please recommend efficient part-time jobs that can be balanced with studies in Seoul.

Hello! I am a university student who came to study in Seoul. I want to manage my tuition and living expenses on my own, so I'm looking for a part-time job that I can do efficiently without interfering with my studies. Are there any jobs near Gangnam, Hongdae, or Itaewon that foreigners can easily do? Currently, I think I can find time mainly after class or on weekends, and due to language issues, I would prefer a job that uses English. I have been recommended to work in cafes or restaurants, but I would appreciate it if you could let me know if you have any other good ideas. I would also like to ask for advice from those who have had similar experiences in this area or know of good part-time jobs!