Maria is a savage lol.
Still, lots of grey morality in the past few chapters. While Maria is cool and all, you can't help to feel that Young-Woong is somewhat justified in his hatred since she was a bitch ( and a bully in a way) to the other students during the previous year. At the same time, you know that maria has the trauma of her family being killed by Ji-tae's father so you understand her bloodlust and why she was an unstable person at the time.