Stars begin to pierce the sky, and you sigh in contentment. Taking off your shoes, you wade midcalf into the water.
Something tickles your leg. You look down, but nothing is there. You shrug it off.
You close your eyes and sigh.
Ice grips your ankle. A choked cry escapes as you are yanked into the water.
You try to find what has you, but the dark water limits your sight. The only thing you can see is a pale shape. You kick, fighting to reach the surface, but you free yourself.
You feel a second grip on you. The pale shape turns into a body. You meet the terrible eyes of you captive as your lungs burn for air.
And then you see nothing at all.
Mul Gwishin 물귀신(or gwisin depending on where you look) is the Korean water ghost. They are the souls of those who drowned and want companionship because they are lonely. Of course that means that they drag down anyone they can reach and drown them as well.
They are so ingrained into the culture they have a saying: 물귀신 작전. It translates to mul gwishin jeokjeon or water ghost tactics. It basically means that you just got sabotaged by someone. Albeit a boss or another person making you suffer along with them.