"My sister and I loved each other despite knowing everything. Can you two do the same?"
I think Park Chan-wook is merciful. Woo-jin might have prolly said to open the box and then shot himself knowing Dae-su and Mi-do now knows everything. Every part of his plan from the very beginning has been achieved. From imprisoning him for more than a decade to raising Mi-do all those years, all for that very moment. How much vengeance a man can hold…