after going to the hospital for a simple flu, you were hospitalised. Staying there, you got bored and decided to wander around. And oh no you went into a private room. And you found a bottle of something weird. Actually a lot of bottles. But you stole one. When you got home, you read the information on it. The substance in the bottle, could change the body. Gender, to be precise. If you inject it, it'll change your gender immediately and irreversible.