It just randomly played on my spotify and I have never heard it before but I am really sorry, I was laughing hysterically at the chorus.
It's called Back to 20 or 20 Once Again
Most people came for Luhan but stayed for the story plot, which is really interesting!
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Full name: Lu Han (鹿晗)
Nickname : Xiao Lu (小鹿)
Birthplace: Haidian District, Beijing, CN