Taemin's big secret is that his Dad is very abusive and drinks a lot when he's drunk he goes into Taemin's room and beats him, Taemin has a fear of getting bullied so he became a bully so he wouldn't be seen as weak, Taemin doesn't like to close his door and leave it alone because once he was sleeping his Dad came in drunk and beat him in his sleep since then he's had terrible sleep patterns and he locks his door with heavy furniture.