Task: Classify the mental state of the tweeter based on the tweet, determining if it is 'neutral or no emotion' or characterized by any of the provided emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
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