Wow he actually drunk that? I'm quite surprised, from the very start of this chapter it looked like its going to be another one "forgiveness" plot trope. It goes like this: they let girl decide Haesoo's punishment, but despite all the hard feeling she's too kind to actually let him die, and she chooses to forgive/forget. Trope is usually used to show how kind and forgiving MC is. After they announced that Soo-a will stay with them for a year, i had little doubts it would end up exactly like that. I mean would you stay responsible for death of one of organisation members, if you'd up to stay in said organisation's care? Such punishment delegation was very unfair on their part because of that.
But in fact it turned out even more bizzare: they made her choose punishment, and then didn't even ask her opinion and Haesoo just decided what he's gonna do alone... Now they effectively removed her from all the decision making, but guilt for all this would fall on Soo-a anyway. WTF?
P.S. I still think that Soo-a would try to stop or save Haesoo because we didn't see explicitly what happens next.