This is not delusional at all.
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1:45 Nayeon says to jeongyeon that while twice has 3, bp only has 1 song. :-D
2:30 Jeongyeon asks nayeon who does she like in blackpink? Nayeon says she doesn't know. Then Jeongyeon replies "for me rosé".
ok next video
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0:25 Mina says "i'm a blink" and nayeon playfully teases her.
0:30 There's some conversation between jihyo,momo and jeongyeon
Momo says " I like rosé" to jihyo and jihyo is like "i like her" and asks jeongyeon about rose and she's like "I like her too why?".
Jihyo asks for a reason and jeongyeon replies she is a unique vocal. Then jihyo says something to jeongyeon and jeongyeon says "uwaaa twice vs beulping (blackpink)". maybe just talking about competition 
