Do I need a medical examination to go to Korea?

They all said they needed a physical examination. I had it when I first went there. It's been a year, and no one asked me to write a medical certificate after going through customs. I haven't checked since. Up to now, people who often run around have never checked the medical certificate. Personally, I don't think it's necessary to check.

It's 400 yuan.

Save it if you can.