When doing a Buzzfeed 30 question interview. One of them ask ' if you chose a friend to save a zombie apocalypse, who will it be?' quickly Dahyun answers " I'll choose Krystal from Iz*one". That made other members curious of her answer so Mina ask " how come?", of course Dahyun didn't hesitate to answer, " because she got more brave than me, and I'm sure she will survive more than me. She'll be my human shield" that made other members laugh of that joke
During one of Lia's vlive, she looks at the comments and one of them ask an interesting question which Lia answer, " Krystal just a sweet personality gal. If you see the video I accidently held her a tight first in human height, I apologize of that". That vlive went viral and Wiz*one quickly except her apology
During Music Bank. Oh My Girl Arin had a script to ask members Miyeon and Soyeon about the collaboration and working with Iz*one's Krystal and Sena. Soyeon first answer about Krystal " Krystal is sweet human being. I'm a mix myself with Minnie and we get along well off camera" Minyeon than answer next about Sena " Kim-Sena is adorable. I could feel her nervousness but slowly over time we bond". Both MC Soobin and Arin nodded their heads to understand," lovely " Arin said while Soobin nods to agree with a smile
Both Aera & Sena had a vlive in giant height in Aera's dorm while the boys are out. Aera read a comment that asked ' do you miss your third friend?'. Aera whisper the comment to Sena and she immediately answers, " heck yeah I miss her! She was like a mother to me. We still hangout but not as much like last times, but we do chat here and there". Aera nods that everything Sena said was true,"trus dat. Also, she haves tight schedule unlike us, so we respect that"
An Weekly Idol Itzy was a guest appearance, one of the host ask Itzy's Chaeryeong if she really friends with Iz*one's Krystal and Chaeryeong replied, " we slowly building a bond, but I'm just greatful my sister not alone in the group"
An interview with James Corden in 2020. James brought up Taehyung's girlfriend of how everytime he knows the right gift for her and he reply with, " it's not all my doings. I owe it to Krystal actually, I go to her of asking because Aera mostly make fun at me before answering my question" that made the members crack a smile or chuckle of the memories, Namjoon the one who translated to James what he said," Krystal from a k-pop girl group the one behind all the good gifts V gave to Sena, he didn't really want to ask Aera or she will laugh at him" that made James and the crowd laugh as well but not at V, but of just hearing that
During the puppy interview with Buzzfeed with TXT, a question from the white paper slip been ask which was Taehyun who reads it, " how you all know Iz*one's Krystal?" the members smile at each other of the memories with her and Aera, " uh.. During the group formed, Aera and Krystal been keeping us in line but also sweet with, um.. With us" Beomgyu answers, Heuning Kai than added," they both look so cute when human size, I could even tell their fears when they walk in the room" the five boys laugh of the memory and move on to the next question