The fact that Haru's future has changed so much is partly his own fault. First, Hana tells him that she is scared,…
but can we blame haru for that?? He lost his lifelong friend and is doing everything he can to save him, he just wanted to see woojae reach the finales, even if it meant costing his own career, he told Hana to not get injured but we can't really control that in those competitions given how inexperienced she was, yes he should've taught her something atleast how to avoid injuries but i think its to portray that drastic actions has drastic consequences.
Him helping Hyeongwon may or may not be a good thing actually, see we don't know what made HW obsessed with hana in the first timeline but now its clear he is obsessed because of what haru told him from hana's body and it was also shown in epi 6 that HW is realising that it might actually be Haru who helped him and not Hana so if he realises and stops obsessing then Ujae could be saved.
and about haru persuading HW, we can only say he was too selfless because i agree with you that haru holding no grudge against HW for his injury is wayy too kind of him but he didn't know HW was the murderer and he is 34 so maybe he just wanted to help a kid out without knowing the ripple effect it will cause.
overall except for being way too nice and kind, Haru has no fault imo😭😭😭😭
I was going to say this same thing! I think he is the killer; maybe in the original timeline Hana rejected him…
but didn't they show it to be hyeongwon after the fight with haru in the second timeline where he first saw the scar?? could it be that junmo hired hyeongwon for his plan??
K-Drama 
Him helping Hyeongwon may or may not be a good thing actually, see we don't know what made HW obsessed with hana in the first timeline but now its clear he is obsessed because of what haru told him from hana's body and it was also shown in epi 6 that HW is realising that it might actually be Haru who helped him and not Hana so if he realises and stops obsessing then Ujae could be saved.
and about haru persuading HW, we can only say he was too selfless because i agree with you that haru holding no grudge against HW for his injury is wayy too kind of him but he didn't know HW was the murderer and he is 34 so maybe he just wanted to help a kid out without knowing the ripple effect it will cause.
overall except for being way too nice and kind, Haru has no fault imo😭😭😭😭