INFINITE's Woohyun talked about putting his personal experience into his title song "Nod Nod" during his solo showcase on May 9.

During this, he said regarding the track, "This title song is a song that while you're listening to it, you can really nod along to.  If you break up, there's an aftermath, and this draws out the image of a man overcoming that with composure."

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Sunggyu, who was MC-ing, asked, "I was curious about this: in this song about the pain of love, did you put in your real-life experience?"  Woohyun put up the "X" sign to say that he had not, but neither Sunggyu nor the fans believed him, so he said, "When I was in my second year of middle school, I wrote and gave a letter. I thought of the contents of that letter while I wrote [this song]."

Of course you did, Woohyun.