SPOILER ALERT!!! (NOT MUCH OF A SPOIL) BUT CONTINUE AT YOUR OWN RISK!!!
You can make your scentio based off this if you want, but so far the verson i have okay.
Japan sank and you were part of it, when it came back you met the Bias and fell in love. The Bias never asked about the date you were born or if you were in Japan when it happened, he just assumed you werent part of it and were born after. One day a fan of BTS spoke about the information and teased you about it, you were really sensitive about the topic and Bias heard that you hurt someone at school and you got severely punished. You never told him what actually happened thinking they would tease you in a way like the girl did about the topic. Eventually the topic comes up a few weeks later, and you started becoming distant when he talked about it, bias notices and locks you in your room until you explain what caused you to be sensitive about the topic, and the truth also comes out about why you hurt the girl
