You're now facing the open passage. Walk straight by crossing the water dispenser on your right. Walk straight completely till you see an open door. From there, turn right and walk straight towards the other entrance. Get inside and walk straight till you see a glass door. From there, turn left and walk straight completely till you three beds at the end. Just before the three beds, take right and enter the room. Stand in front of the second mirror in the room and you will reach your destination.