Returning to Korea on an E-7 visa: has anyone applied from overseas?

I used to work in Korea and I’ve been thinking about coming back, this time aiming for a more stable, skilled job through an E-7 visa. Right now I’m living outside Korea, so I’m wondering how realistic it is to apply for an E-7 from abroad. Has anyone here actually gone through the process while living overseas, especially after already working in Korea before? Did you apply straight from your home country, or did you secure a job offer first and go from there? Would really appreciate any tips on how the process works and what to prep for.