Hi, I've been looking for this novel for ages but I can't find it -_- So, the original goods was obsessed with the prince and is chasing after him when she gets kicked in the head by his horse. That's when our MC comes in with a cold/emotionless personality. She had a sister who was really good at magic and hated her and they had a fight where MC destroyed her - the prince and MC's bodyguard were watching this but didn't intervene and MC was pissed. Uh, there was also a later scene when a foreign prince came to the school and was originally arrogant etc but got beaten up by the MC and became an ultra masochist. I think MC's love interest was the bodyguard but it was a bit reverse haremy. Any help would be very welcome!!!