From student visa to temporary visitor

Hi everyone!
I’m about to graduate from a Japanese language school in Tokyo, but unfortunately, I haven’t secured a full-time job by the end of my 2-year student visa. As a result, I’ll need to leave Japan soon. However, I’m planning to return as a tourist for an additional 2 months by obtaining a short-term visitor visa. To do this, I was planning to do a short trip to Seoul.
I’m concerned about potential issues when re-entering Japan from South Korea. Has anyone else gone through a similar process? How smoothly did it go for you?

Thank you.