I am a child of a multicultural family. I have dual Thai and Korean citizenship. I used a Thai passport when I went to Thailand and a Korean passport when I returned to Korea. However, when I recently arrived in Korea, an immigration official at the airport asked me, “Why is there no entry stamp in my passport?” So I said that I use Thai passport as well. Then the immigration official said that now that I am 21, I have to choose only one nationality. I know that women can have multiple nationalities. Do I have choose my nationality now?
How can I keep my multiple nationalities citizenships?