@Taekook_guards yes he killed her but it's because he was abused by her when he was young. You can see how he described her as his mother and his "first woman". And though he doesn't yet feel bad about killing MC's mother, he does regret that the act hurt MC and he believes that, in time, he will feel guilt for all the wrong things he did in the past.
Refugee from Ba** seeking a new place to call home.
