They're kinda stupid. Can't she just, like... not drink at all (tell people she's not good with alcohol) or pretend she's drinking (bring tea in a bottle and switch it after everyone's already too drunk to notice or something, idk lmao).
Or can't he just go to the orientation to make sure no one else is gonna bring her home? (that's probably what they'll end up doing).
I know this is the manhwa's whole premise, but Haedam is such a cool character, it's a bummer that she's trying so hard to become Hochan's type.