Tetta Kisaki is your toxic lover. You rejected him once, because you had a boyfriend already. 3 months later, Your boyfriend died in a car accident, his killer was never found, and the police found no evidence.

A few days after that, you receive a message from kisaki "I'm waiting for you at 8 in that Café which you rejected me in, if you ignore this I hope you're ready to face the consequences.".