EUODIAS
HENRY PRINCE MAK
Prince Mak from JJCC, the KPop boy band from Jackie Chan
He told his story while he was still an idol
He starts talking about his idol experiences at around 32:30 in his podcast, embedded in the link.
Check out his recent solo work
COCO
The first of her many Tea Time with a KPop Idol series, with Gina
GINA
Gina's story, in Korean, with English Subs
Others who cared to share:
eSNa - Not So Classy Podcast
Her whole podcast is great.
Way from CrayonPop - WAYLAND
She has a series on telling the inside scoop about idol life. In Korean, with English subs.
IMITIATION - K Drama
If you get a chance, check it out to see how the lives of fictional idols play out as acted by real idols.