Apparently they were dating whilst shooting so when they had the day of they would go on dates since seeing each other whilst working wasn´t the same as seeing each other on their days off, or something like that ^^
To prevent more deaths they should tell the public not to wear skirts and stockings.
Since he has been killing in the same ways for 30 years or so I don´t see him changing his tactics though. But you´re right the police really should tell the public that there is a killer after girls in their twenties. Bt really the public should know not to walk around alone at night, I´m pretty sure that they all watch the news or have heard of the young girls getting killed.
To prevent more deaths they should tell the public not to wear skirts and stockings.
I don´t think he would change his tactics that much since he only goes after girls in skirts, so there must be a reason for that, thus he would not get that satisfying feeling from killing a girl that is not wearing a skirt, and it would definitely not satisfy him to kill if it is not with his prefered weapon, the stockings.
It annoyed me too much how they tried to ship Soo Ah and Dong Jae so much, and at first I had a feeling that they tried to ship her with Ha Joon, that was quite annoying too. It came of too forceful for me...