Responses
When taeman was working as a cashier, pink-hair came in acting like an asshole and started a fight. Dahyuk saw this and tried to save taeman, then taeman acted to save dahyuk (can't remember what he did but he somewhat broke character). It's enough to see that they know each other and it's their only lead
I can't seem to find the chapter that explains how the octopus gangsters know Da-hyuk is connected to Tae-man? When did that happen and how do they know their connection??