
Siwoo was a witness to how Dohyeok treated Suha, how he hurt him and obviously tortured him by forcing Suha into a 3some. Without realizing it Siwoo had hated Dohyeok deeply and cursed him. Especially when Dohyeok started to like SIwoo and did extreme ways just so that Siwoo would not leave his side, it made SIwoo hate him even more. it's right that the author doesn't make them a couple. their relationship is a hell that makes them hurt each other.
Translated with DeepL.com (free version)

When i read the panel 3rd years graduated, i think that "Ah, no more Daichi or Suga, or Asahi and Kiyoko." and I'm overwhelmed with feelings because we read from early chapter and saw them graduated like a parents let their kids move out from the home.
Also several years later it means they are at their 20's? Tbh I'm curious about how come Hinata come to Brazil. I hope Kageyama also training with him. It's pointless named Haikyuu if not included two main characters (⊙…⊙ )
Also i got some Captain Tsubasa vibe from Brazil scene :'D
Last but not least : where is the final arc about Fukurodani and the rest of match? ( ̄へ ̄)

Actually this is reality when you play with powerhouse school before the current match. Not only Hinata but all the Karasuno's players are tired and even have a cramp game. So if they are losing this game, it's the reality like will happen in real life. Ok don't mind me, I'm just rambling out and will crying at corner ┗( T﹏T )┛
i volunteered for the money, papa