I feel like the NCT hyungs really treat Jaehyun well and baby him a lot when he was still the maknae in their smrookies group so when the younger members showed up he treated them as his hyungs treated him then... with love uwu
The first neos actually came to sm around the same time and pretty much trained together but they are also separated into 2 groups which is the older members and the baby shinkies🥺