Task: Analyze the tweet's sentiment and assign it to either 'neutral or no emotion' or one or more of the specified emotions (anger, anticipation, disgust, fear, joy, love, optimism, pessimism, sadness, surprise, trust).
Tweet: Remembering those day when u still did'nt know kpop n thinking about how sad your life was without it - Kpop fan
This tweet contains emotions: 
sadness