I don't think it is referred to directly in the live-action drama, however in episode 42, Wei Wuxian refers to Guangyao having a good memory. He only had to look at a page of music in the Forbidden Library (of the Cloud Recesses) once to memorize what he needed (and then he twisted the notes to damage Nie Mingjue). And, of course, he also has the knack for remembering the identities/faces of everyone who treats him poorly - no matter how small the slight.
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