The sheer agonizing pain of Wit just never getting over Win's death, the way he stands in the street where he died, the way he cries, the way he fights with everyone. There's pain he can never get past, even in death.
Win's death leaves Wit in agony and that agony is still going, still hurting people, still hurting him and his family and the ones he loved.
Win's death left so many scars on so many people, scars that have never gone anywhere and never will go. From Tha's forehead to Kaew's wrists.
These are scars that never go away.
Seriously, if this show were mostly Wit and Win from the beginning, I'm 100 sure there would be a much bigger fanbase.