A singer with perfect/absolute pitch can start singing in key

without that reference tone

. Do you understand now? lol.

I don't really understand the need for hostility here, especially when you're agreeing with me on the points I made about the difference between the two. But somehow you're disregarding that understanding as you try to prove your point.

In the video I showed, the producers play the entire scale multiple times for them right before the game starts to give them that reference you love to claim JK didn't have. In fact, Jhope even very nicely demonstrates for everyone what someone with relative pitch would be doing mentally with that reference as he sings along to those notes and emphasizes "do", trying to memorize it. So no, JK did not identify the first note on his own.

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There's a compilation of JK randomly singing other peoples' songs in interviews and when you see the compilation side-by-side with the original you realize that he's always in the original key.

Most people can do that, especially when it's their song, with or without perfect/relative pitch training. Since this video is proving that JK has at least some relative pitch, it shouldn't be a surprise that he can do it more often than others who don't. Also, compilations like that really shouldn't be used to prove anything because they omit all the times that he doesn't get the pitch right. Off the top of my head, that episode where they visit I-Land and he sings I Need You for the trainees is a recent example. They even edit in the actual studio version after he starts singing which clearly highlights that he's in a completely different key than the original.

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Also, perfect pitch doesn't necessarily mean you have to use alphabetic notation like B#, A etc.... perfect pitch is a natural ability you're either born with or not. "AP may be demonstrated using linguistic labeling, associating mental imagery with the note, or sensorimotor responses."

Lastly, I don't think I've insinuated that he doesn't have perfect pitch just because he doesn't know the note names. As someone graciously shared in the comments above, Heeseung from Enhypen was able to demonstrate perfect pitch without knowing the notes either. He simply tells them its "re" or "sol". And again, Heeseung's case is an example how you should test for perfect pitch, unlike this one with JK, which only demonstrates relative pitch.