You bought a vip stage ticket at his concert. You were watching him, but then someone pushes you at the stage. The person who pushed you was your enemy. She pushed you so you can be embarrassed but you were actually his boyfriend. You started to sing because he was singing that is 2 people singing the song.

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He was happy that you were singing with him. Both of you are singing (the end)

"Sing a song, Sing along!"