Idols who are close with CIX BX/Byounggon :

-TREASURE Choi Hyunsuk (July debut)

GonSuk, i think we all know about this. Byounggon always called Hyunsuk and asked him if he had eaten yet.
Byounggon is close to all of TREASURE members because they've trained tgt for a long time, especially with Suk-Ji-Kyu-Dam-Hoon.

-Golden Child Jangjun

Their first moment was on ISAC 2019, Byounggon was seen talking with Jangjun. Also, during Numb promotion on music show, CIX thanked GoldenChild fans for cheering for them and one of the member (i'm guessing it's Byounggon) said he's close with Jangjun.

-D1CE Woo Jinyoung

They're really really close, they mentioned each other a lot. Byounggon even texted Jinyoung on D1CE debut day, congratulate him for the debut. And recently, Byounggon also talked about Jinyoung on VLIVE "I'm close with Jinyoung hyung, our hyung is really kind

-AB6IX Jeon Woong

They are actually more like older brother and younger brother, hence they are really close. During MIXNINE days, Byounggon called Woong on the phone. They mentioned each other a lot on their own VLIVE or fansign.

- Stray Kids Han

Both are students from DEF Dance Academy, their first moment was seen during ISAC 2019 and seemed really close. They also greeted each other on VHEARTBEAT Award last year.

-ONF Wyatt

They're also more like older-younger brother and yes they're really close. Byounggon once posted a video of Wyatt on his instagram story back then in 2019. Wyatt really take good care of Byounggon, they meet when Gon finished YGTB and sharing stories.

-ONF Hyojin

Their first impression to each other was not that good lol, but Byounggon said he and Hyojin have a lot of things in common that's why they got closer. Around March 2019 (or maybe late February), Byounggon went to eat chicken with Hyojin, Wyatt and J-US.

-1Team BC

Friends since MIXNINE days, i really love them!! They got teamed up for about 3 missions. During Numb promotion, they spotted together on a music show behind cam. Sungho looks so tiny next to Byounggon omg

-A.C.E Byeongkwan, Donghun, WoW

I haven't seen WoW talked about Byounggon after MIXNINE (or did i missed out), but they're also close to each other, like how it seen from their behind pictures, Byounggon said he meet WoW at the music show waiting room sometimes.

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While Byeongkwan and Donghun talked about Gon a lot on their Vlive, Byeongkwan even called Byounggon 'baby Gon' or 'baby BX' Byeongkwan is the one who really doubted about Byounggon's height lol, he said it's a mystery

-ATEEZ Hongjoong

Both 98 liner, they got closer through MIXNINE. They were together as guests on Idol Radio (with ONF Wyatt), Byounggon said on VLIVE that he's really close with Hongjoong!

-1Team Rubin

Pretty sure they've meet on music show because their promotion was overlap that time. Rubin once danced to Movie Star during 1TEAM fansign (i lost the video). Rubin to Byounggon : you know i like you a lot, right?