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In the Korean comments

Several comments pinpoint the exchange around 4:25. One reads, in translation, “Bbinnyang is giving his older member a legendary cat-yowl, while ‘cat hyung’ just laughs as though his cat-like little brother is cute.”

What the words mean

“캬옹” (kya-ong, a stylized cat yowl) is not ordinary dialogue here. Commenters use variations such as “캬엉” (kya-eong, cat yowl) and “캬아악” (kya-aak, screeching yowl) to recast the member’s sharp, animated reaction as an exaggerated and affectionate burst of cat behavior.