How do I receive a recommendation letter after completing EPIK in Korea?

Hello, I am curious about how to receive a recommendation letter for the next teaching contract after completing the EPIK program. I heard that teachers who finished EPIK in the past received recommendation letters after their contract ended. I wonder if I still need to contact my previous school directly to get one. I understand that recommendation letters play an important role for foreign teachers who have recently completed the EPIK program and are preparing for another teaching contract. Especially in areas like Gangnam or Hongdae in Seoul, a recommendation letter may be necessary when entering into a new contract. Is there anyone who has successfully received a recommendation letter through contacting their previous school? I would appreciate it if you could share your experiences or tips.