Situation: Chaeyoung and Nayeon were originally together while Dahyun was talking to Sana, so Dahyun joined the pair as the third party. In the second picture, you can see that Nayeon is still talking to Dahyun.
About the gif with Nayeon only linking arms with Chaeyoung, she has a habit in general of linking arms with whoever's to the right of her, like with Mina in the second picture.
In this gif where it looks like Nayeon's making a face at Dahyun, she's actually looking sad and turning to Jungyeon to tell her that "there's nothing there".
1. [+103, -14] Nayeon bought Dahyun a present for becoming an adult and even asked to go spend the night at a sauna together to get closer to her but of course people don't see that
2. [+100, -10] Look at this before hating on her
3. [+81, -7] If Nayeon was the type of personality that everyone's accusing her of, she wouldn't be nice to her in pictures and moments off camera like this
4. [+37, -2] If you hate Twice, just shut up. Think of the fans who have to put up with all these accusations. JYP is not stupid enough to cast an idol with a trash personality. They're famous for kicking members no matter how talented they are if they don't have the right attitude.
5. [+30, -0] But people will never see clarification posts like this~~~ they only care about the controversies ㅋㅋㅋㅋㅋㅋㅋ
6. [+22, -2] You can never hate a JYP idol for their personality
7. [+16, -0] It's just a bunch of antis... Try as they may, it doesn't change the fact that Twice is popular and pretty
8. [+14, -0] I don't get how gifs like these are any indication of a person's entire character anyway. How do you function in real life?
9. [+13, -0] At their concert when everyone was bowing in skirts, Nayeon was the one pulling everyone's skirts down ㅋㅋ please stop focusing on the negatives
10. [+10, -0] Really must suck to be Twice fan to have to put up with this...