BIGHIT MUSIC’s TXT is a boy group, but that doesn’t stop the youngest member, Huening Kai calling the eldest, Yeonjun noona. Any Korean culture enthusiast would know noona doesn't fit a male. Noona is a term of respect used by males to address an older female friend or sister out of respect.Huening Kai’s latest interaction on Kiss The Radio with MOAs (TXT’s fandom) on October 26 has fans trending ‘yeonjun noona’ on Twitter. As fans reminisce about the fun moments with the TXT members and miss Yeonjun in his ‘noona’ era, let’s look at what and how the whole trend started.MOAs trend ‘yeonjun noona’ on Twitter as TXT’s Huening Kai announces new TuKiRa DJHuening Kai was the DJ for Tomorrow X Together’s Kiss The Radio (aka TuKiRa) on October 26. He ended his episode by telling MOAs that the new host for October 27’s show would be Yeonjun. However, instead of calling him hyung (a word males use to address older male friends or brothers out of respect), the youngest took the opportunity to tease him by calling him “my Yeonjun noona.”With Huening Kai calling Yeonjun “noona” again, fans have taken it upon themselves to call him the same, regardless of their gender and age, to have fun.TXT Translations 📝@translatingTXT🐧: tomorrow’s show will be hosted by my yeonjun noona~ tomorrow x together’s yeonjun! please look forward to this! fighting, yeonjun noona~ @TXT_members @TXT_bighit8:26 AM · Oct 26, 202168151506🐧: tomorrow’s show will be hosted by my yeonjun noona~ tomorrow x together’s yeonjun! please look forward to this! fighting, yeonjun noona~ @TXT_members @TXT_bighitjujube YOUNGEUN DEBUT !@sprkltyuniethis is me trying to summon yeonjun noonamy offerings are soob butt, food, and pull-up bar twitter.com/cutecatfox/sta…ً@cutecatfoxremember when yeonjun would spam selfies on weverse during minisode era?9:02 AM · Oct 26, 20211005remember when yeonjun would spam selfies on weverse during minisode era? https://t.co/M9dY95bKJpthis is me trying to summon yeonjun noonamy offerings are soob butt, food, and pull-up bar twitter.com/cutecatfox/sta… https://t.co/kW5Ftis6a0a ◡̈@prodcyjnHYUKA CALLED YEONJUN NOONA AGAIN I CAMT BREATHEEEEEEEEE8:25 AM · Oct 26, 202117612HYUKA CALLED YEONJUN NOONA AGAIN I CAMT BREATHEEEEEEEEEAsterin⁷ ♡s VoiJen@crazy4kookMoa besties why are we trending Yeonjun Noona 🤡😭😭Ik about the pink hair yeonjun being teased by the other members but why y'all remembering it again 🤣😭10:15 AM · Oct 26, 2021163Moa besties why are we trending Yeonjun Noona 🤡😭😭Ik about the pink hair yeonjun being teased by the other members but why y'all remembering it again 🤣😭 https://t.co/ORUcsnf39Mthinking about yeonkai@dollyeonkaia small compilation of huening kai calling yeonjun, "yeonjun-noona" <312:00 PM · Oct 27, 202112a small compilation of huening kai calling yeonjun, "yeonjun-noona" <3 https://t.co/0796OjqbOjkimu 🐻🍓/ FROST D-1@lovabeomHUENING KAI SAID "YEONJUN NOONA FIGHTING" boyy yeonjun never beating the noona allegations8:25 AM · Oct 26, 2021505HUENING KAI SAID "YEONJUN NOONA FIGHTING" boyy yeonjun never beating the noona allegationsً@TrulyHyukas@translatingTXT @TXT_members @TXT_bighit MY YEONJUN NOONA8:27 AM · Oct 26, 202129@translatingTXT @TXT_members @TXT_bighit MY YEONJUN NOONA https://t.co/ychaAnmu9PIt isn’t the first time Huening Kai has called Yeonjun noona, and fans again love it. So, how did it start?In October 2020, TXT released their third EP minisode1: Blue Hour. The Blue Hour era remains etched in fans’ minds as Soobin colored his hair blue and Yeonjun pink. In performances for their B-side track We Lost the Summer, a track reminiscent of the times teenagers lost due to the pandemic, Yeonjun tied his hair in a ponytail, looking chic.In a vlive on October 31, 2020, fans commented on how much they loved his ponytail. Reading the comment, Huening Kai revealed that these days he calls him "Yeonjun noona."TXT Translations 📝@translatingTXT🗣: yeonjun, i really like your tied up hair in 'we lost the summer' it looks really good on you🐧: i really like it, it's my favorite hair on..yeonjun noona. when we're in the waiting room, we call him 'yeonsoon noona', it's so charming +@TXT_members 5:28 AM · Oct 31, 20202768570🗣: yeonjun, i really like your tied up hair in 'we lost the summer' it looks really good on you🐧: i really like it, it's my favorite hair on..yeonjun noona. when we're in the waiting room, we call him 'yeonsoon noona', it's so charming +@TXT_members https://t.co/wtMX56bKl0Later, in November, M2 released a behind-the-scenes episode of the Blue Hour comeback showcase where Huening Kai came to Yeonjun's side, calling him his favorite term of endearment.When Yeonjun asked others to comment on his style, Soobin and Beomgyu said he looked like his aunt, Taehyun gave him one star out of 5, and Huening Kai, of course, called him “a cool noona.”Watch the below video from 5:32 to 7:07:While fans might not know precisely when behind-the-scenes, publicly, it started from the Blue Hour comeback showcase. Since then, he has called him noona on multiple occasions - uploading a sketch of Yeonjung with the caption “Today’s Yeonjun noona”, calling him “Yeonjun unnie”, and replying to a comment on Weverse with the same term of endearment.Meanwhile, TXT dropped cinematic solo posters for their upcoming Japanese comeback album Chaotic Wonderland. The album will be released on November 10, 2021.