You're facing towards the mirror, go near the mirror and then slightly turn to your right, move straight, you can see an open door, go through the open door and then slightly turn to your left, you can see an glass door, go through the glass door  and then slightly turn to your left, you can see an open door, go inside the open door, move forward at your left, you can see an walkway, go straight, you can see stairs, stand on the 1st stair this is your end point.