There are several ways idols tend to recognize each other and usually it is either through their famous songs or through certain dance steps which had gone viral.
It is the same for SEVENTEEN‘s SeungKwan and ChungHa when they appeared on SBS “Master Key” previously.
In the show, they were completing their team mission and SeungKwan managed to find Chungha’s pillow. He tried to call and notify her by singing the lyrics of her song ‘Why Don’t You Know’ and called her ‘Why Don’t You Know noona’.
When ChungHa heard her song, she immediately turned and started looking for SeungKwan who had sang it.
To show her appreciation, she also starting singing SEVENTEEN’s song ‘CLAP’ by saying ‘clap clap’!
Viewers who had watched that episode were commenting on how smart the two idols were in promoting each other’s song. Although it was a short moment, we were sure that SeungKwan and ChungHa must have felt proud of each other for knowing their songs.
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