You can check out game guide on 12SKY LAST EMBER
PvP and Status
1. You can attack other users when the PvP button is activated.
2. Attacking a user in Neutral (white) will change your character into Engage(purple) status
3. Attacking a Chaotic(red) user, your character will remain neutral.
■ Evil penalty
1. Killing an opponent in Neutral / Engaged state is subject to a evil penalty
2. Chaotic level decreases when you kill monsters or your character dies.
3. Depending on your evil level, penalties such as not receiving experience, not being able to enter towns, and dropping items you have are applied.