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??
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
Choi Yitae shows up first in a couple of panels of chapter 54, leaning on Woojin after they were fighting while him, Yitae, and Ho In were all in high school! Apparently they all went to the same high school, but Yitae was in a different class than Ho In and Woojin!
His first memorable appearance is in chapter 59, where he's on a "date" with Woojin (it's not officially a date because Woojin won't be honest with his feelings, lmaooo). He's sulking about Woojin fussing over Ho In being mad at him and not answering his phone instead of paying attention to him (Yitae).
but I honestly totally understand the bully being the way he is (although it would make sense to just ice out our main redheaded lead instead of constantly fucking with him). The coach is absolutely shitty for trying to get him (and both of them, tbh) to swap places like that, and also, that's a fast pass to giving someone an eating disorder. What the hell!
Can't stand Jooin's younger brother!!! You both grew up in a fucked up and abusive household BECAUSE OF your useless DAD and your useless ASS GRANDMA!! Go jump your daddy instead of Jooin since you already got revenge on Jooin's shitty mom !!!
I srsly rly like that u supported him killing the mom