Task: Categorize the tweet's emotional expression, classifying it as either 'neutral or no emotion' or as one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust) that reflect the tweeter's state of mind.
Tweet: So I'm not being shady but one of Jongdae's ex rumoured girlfriends is going on WGM I'm not saying I'm over joyed but I'm over joyed #bitter
This tweet contains emotions: 
joy