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What's the joke in the MV "You are not really happy" in Mayday?

The monster said, "Really happy?"

Because:

1.MV takes about 3 minutes, and the screen shows "Really happy?" Words. It means that every time I listen to laughter, I think of the previous sentence. I feel really happy and my face changes.

2. Some people listened to the fake smile, but everyone pretended to be willing to admit their inner pain and pretend to be happy. Xiao Yu, laugh with the whole world.

Our report is over.