What do you mean unreliable narrator? I feel like i miss something huhu
maybe unreliable narration are not the right words but when you re-read the first chapter many questions pop up for me like "Why does Guwon know Teach's full name even tho Teach didn't introduce himself?". Next to Teach is his dad's body and Teach himself seemed injured that's why Guwon put bandage on his head but Guwon doesn't have any blood on him at all in comparison to the recent chapters where he (kinda) loves being drenched in blood. Makes it look like he didn't killed Teach's father and stumbled upon them when Teach already killed him. There is framed picture shattered exactly where Teach's father stands... for me it kinda leads to the conclusion that Teach and his father fought and then baaam killed his dad and hit his head. With no prior memory to this incident he seems kinda unreliable or kinda like all over the place (AAAARGH sorry english is not my first language ┗( T﹏T )┛)
an unreliable narrator is basically a storyteller who cannot be trusted. We don't really know what hes saying is whats happening, a lot of things do not make sense from his narrating
What made me wonder was the panel of the piled up bodies and Teach be like "Why does this feel so familiar"... like maybe once his past is "unlocked" to him, he might realize that he is also like Guwon. Teach's unreliable narration kinda hints at it.