Q: Would you advise about a case presentation?

Thank you for your question! It should be acceptable to present the same case in the international conference as long as you cite the domestic conference proceedings appropriately. Moreover, assuming that the case was co-authored in the domestic conference, there should not be any conflict of interest amongst the authors before its presentation in the international conference.

Also, here are some resources about a conference you might find useful.

• 8 Tips for presenting a paper at an academic conference
• Making connections at international conferences
• Virtual Conference Presentation Packs

I hope this helps. All the best for your presentation!