Responses
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You can try checking international certificates such as ICAEW/ACCA/MICPA there's tons of scholarships and universities that offer it and you can use the certificate worldwide. you can go through finance/tax/investment or like in the story being an auditor hehe
although for this manga specifically investigating fraudulent behaviour in insurance there might be degrees out there with specialisation but hope this helps !!
im going into audit and the way i was concerned on their intergrity and professionalism anyways this is a good story and im so glad the mc didnt resign and just move to another area of interest haha