Tolerance To Insanity

Since her childhood, Irina has been known as the sweetest girl someone would ever know. No matter how selfish the request was, she would try her best to refill it. Even if it could cause her to lose her most adored things. But no one had the simplest idea of what she was bearing behind her sweet smile.

One day, it started to change. She was no longer the girl she once was. Just a simple word could piss her off. Her temper could guide her mad enough to make her kill someone.

What changed her? How did she change so much? From the kindest to someone with a heart of stone...