I think it’s more like an emotional bond/connection between them.
In the original sentinel/guide first there really wasn't imprinting, just more of like really hard to get any sort of guiding from someone that wasn't a "match" to the sentinel. (Think like soul mates)
But since I've read the actual novel of this (I have like 20 more chapters to go), in this fiction particularly... it's very similar to like, cultivation novels & omega verse bonding?? Like they basically get intimate and forge a bond (omega verse similarity is from there being like some sort of chemical involved i.e. saliva)
since I'm not in korea I can only read the 15+ version so it wasn't super precise about it lol
I was wondering how does imprinting happen. I havent read many guideverse manhwas, but i still have yet to witness how does one imprint the other? (づ￣ ³￣)づ