Kanghee is definitely a snitch

There's a reason !! (As a novel reader)

A bad one or a good one (as in readers could easily sympathize with him)?

He is morally Grey, you have the option to understand him by loving or hating him but including eunho with his revenge and HURTING eunho shouldn't have been the case, but if kang hee was the mc I'd honestly support eunho dying for the sake of revenge and peace but I love my bb eunho so no HAHAHA