Someone's in the bathroom

It was 1 AM, and I had just finished showering and was about to go to sleep when I suddenly heard the sound of water from the bathroom. I thought maybe I hadn't turned off the faucet completely, so I turned back to check. There was no one in the bathroom, and the faucet was indeed turned off. I dried my hair and went back to my room. Not long after I lay down, I heard a 'drip, drip' sound from the bathroom again. Getting a bit annoyed, I grabbed my phone and went back. This time, I stopped at the doorway without going in. The sound of water seemed to be coming from the shower. I slowly pulled back the shower curtain. It was empty inside. Just as I was about to close the door, my phone suddenly vibrated. It was a message from a friend. "You're not asleep yet?" I replied, "There's been a constant sound of water in the bathroom." My friend quickly replied: "Don't you live alone?" As I looked at the message, about to reply, a very faint voice suddenly came from the bathroom. "Are you looking for me?" I froze completely. The voice was coming from behind me. I didn't dare to turn around, so I slowly lowered my head. On the floor, there were wet footprints that I didn't know when they appeared. The footprints extended all the way out from the bathroom. And the last footprint stopped right behind my feet.