Overdose.

The day after her boozy birthday party, Mars wakes up to discover the body of her boyfriend stabbed. Immediately, she becomes the primary suspect: her DNA was found on the murder weapon, a knife used to cut the cake. She proclaims her innocence, but faced with the overwhelming evidence, her lawyer suggests she pleads guilty, while Sand's brother challenges her to find the true culprit if she truly is innocent. Once released, Mars decides to take revenge for the trap that was set on her.