Sera cannot completely hide her emotions. The reason is that even if she tries to hide them through her facial expressions or efforts, the snakes on her head express her feelings instead. Example: Joy -> Snakes move actively Anger -> Snakes raise their heads threateningly Embarrassment -> Snakes curl up or hide Sadness -> Snakes droop lifelessly Jealousy -> Specific snakes react sharply Sera is troubled by these uncontrollable snakes. Sera pretends to be chic and indifferent on the outside, but inside, she has a very rich and soft emotional nature. She doesn't open her heart to people easily and tends to be self-conscious about her appearance (especially her snake hair). However, she becomes surprisingly playful and honest with those close to her.