The water grass grows along the banks of the slow-moving rivers in the southern counties.

It looks like ordinary mint. The leaves are the same shape, the same color, the same scent when crushed between the fingers. The only difference is the root—a pale, fleshy thing that splits into three tendrils, each one ending in a bulb the size of a fingertip.

Chew one bulb, and you die within the hour.

Not from poison. The body does not convulse or foam or turn blue. The heart simply stops. The lungs stop. The blood settles. You lie down and do not get up.

And then you become one of them.

The water grass ghosts. The ones who wait by the riverbank, watching travelers, hoping someone will mistake the leaves for mint and pick them. Because the only way out is to pass the curse on. Find someone else who does not know. Watch them chew. Watch them die.

Take their place in the cycle.

I learned all of this too late.

My name is Zhu. I was twenty-four years old when I stopped by the river to rest. The sun was high. The road was long. I saw the mint growing near the water’s edge, fresh and green, and I picked a handful to chew for the thirst.

I did not know what mint looked like.

I know its shape now. The shape of every leaf, every vein, every serrated edge. I have studied it for two years, sitting on this bank, watching it grow and die and grow again. I could draw it from memory. I could describe it in my sleep.

The taste was sweet at first. Then bitter. Then the world went gray at the edges, and I felt my knees hit the ground, and I lay down in the grass and watched the clouds move across the sky.

I do not remember dying.

But I remember waking up.

I was standing on the riverbank. The sun was the same. The water was the same. But everything had a thin film over it, like looking through dirty glass. I could see the road. I could see the grass. I could see my own body lying on the ground, face-up, eyes open.

A man stood beside me.

He was dressed in clothes from another decade—a robe that had been fine once, now frayed at the cuffs. His face was pale. His eyes were the color of river mud.

“New,” he said.

“Where am I?”

“Nowhere.” He gestured at the river. “You ate the grass. You are dead. Now you stay here until you find someone else to eat it.”

“Find someone—”

“To replace you. That is the rule. You died because someone let you eat the grass. You stay dead until someone else does the same.”

I looked at my body. A cart was approaching on the road. The driver saw me lying there and pulled his horse to a stop.

“I cannot just—”

“You will.” The man’s voice was flat. “Everyone does. A month on this bank, watching the living pass by, and you will see. You will do anything to leave.”

He turned and walked away. I watched him disappear into the trees.

I stayed on that bank for two years.

I watched travelers pass. Merchants with their goods. Scholars with their books. Farmers with their produce. Women carrying baskets. Children running ahead of their parents.

I watched them stop at the river. Drink from the water. Rest in the shade.

A few noticed the mint. A few reached down.

I opened my mouth to warn them.

Every time.

The first one was an old man. He knelt by the water, washed his face, noticed the mint. His fingers closed around the stem. He was about to pull it.

“Stop,” I said.

He did not hear me. The dead cannot speak to the living. The sound comes out as wind, as rustling leaves, as nothing.

But something made him pause. He looked around. He let go of the stem. He stood up and walked back to the road.

I do not know if he heard me. I do not know if some other ghost was watching, laughing at me for wasting my chance.

I did not care.

The second one was a young woman. She was traveling with her husband. She was tired, hot, sweating in the afternoon sun. She saw the mint and bent to pick it.

“Stop,” I said again.

She straightened. She looked at the river. She looked at her husband, who was already walking ahead.

“Coming?” he called.

She looked at the mint one more time. Then she followed him.

I watched her go. The river kept flowing. The grass kept growing.

The man in the old robe came back sometimes. He stood at the edge of the trees and watched me.

“You are wasting time,” he said.

“I am not going to trap someone.”

“Then you will stay here forever.”

I did not answer.

“Three hundred years,” he said. “That is how long I have been here. I found my replacement on the third day. I was gone within the week.”

“Then why are you still here?”

He looked at me with his river-mud eyes. “Because I came back. To warn people. To undo what I did.”

“Does it work?”

“No.”

He left. I stayed.

The third season came. The mint grew thick along the bank. I sat among it, watching the leaves sway in the breeze.

A boy came to the river. He was young. Twelve, maybe thirteen. He was carrying a bucket. He knelt by the water, dipped the bucket in, and waited for it to fill.

He noticed the mint.

The smell was strong that day. The leaves were at their peak. He reached for them.

I stood up. I walked toward him. I knew he could not hear me. I knew it did not matter. But I walked anyway.

“Boy,” I said.

He froze.

His head turned. His eyes scanned the bank. They passed over me—passed through me—and kept scanning.

“Who said that?” His voice was thin. Scared.

I did not answer. I did not know how.

He picked up his bucket. He stood. He looked at the mint one more time, then turned and walked away.

I watched him go.

The old man was standing in the trees. Watching.

“That has never happened,” he said.

“What has not?”

“A living person hearing a dead one.”

We looked at each other across the bank. I did not know what it meant. Neither did he.

That night, I felt something change.

The world was not as gray as before. The film over my eyes had thinned. I could see the stars more clearly. I could feel the wind on my skin.

I walked to the water. I looked at my reflection.

I was still there. Still pale. Still dead. But my face looked different. Younger. The lines of worry and regret had faded.

The old man came to me the next morning.

“The judges have noticed,” he said.

“The judges?”

“In the underworld. They review the records of the dead. Yours was flagged.”

“Flagged for what?”

He shook his head. “I do not know. I have never seen it before. A death that should have been replaced but was not. A ghost that was supposed to pass the curse but refused.”

“Is that bad?”

“I do not know.”

I spent the next days waiting. Nothing happened. The river flowed. The mint grew. The travelers passed.

Then, on the seventh night, I saw the light.

It came from downstream. A warm glow, moving against the current. It grew as it approached, taking shape—a figure in white robes, standing on the water, holding a lantern that cast no shadow.

The figure stopped before me.

“Zhu,” it said.

“Yes.”

“You have been reviewed. Your death was not your own fault. Your refusal to pass the curse has been noted. You are granted release.”

I stared at the figure.

“Release?”

“From the cycle. From the bank. From the curse of the water grass.”

The figure raised its lantern. The light touched my chest. I felt warmth spread through me for the first time in two years.

“The one who gave you the grass,” the figure said. “She has been found. She will take your place in the waiting. You are free.”

I looked back at the riverbank. At the mint growing in the moonlight. At the old man standing in the trees, watching, his mouth slightly open.

“What about him?” I asked.

“He has been here for three hundred years. He found a replacement once. He is bound to this bank until his own replacement is found.”

“That is not fair.”

The figure did not answer.

I walked to the edge of the trees. The old man did not move.

“He cannot be saved?”

“Not by you.”

I looked at the old man’s face. The mud-colored eyes. The frayed cuffs. The years that had passed him by.

“Then I will stay,” I said.

The figure’s light flickered.

“You cannot change his fate.”

“I can choose mine.”

The light dimmed. The figure stood silent for a long time.

“The judges will not wait forever.”

“Then they will have to wait.”

The figure turned. The light moved downstream, shrinking, fading, until it was gone.

The old man stared at me.

“Why?” he asked.

“Because someone should have stayed for me.”

I sat down on the bank. The mint rustled in the breeze. The river carried on its endless conversation with the stones.

The old man sat down beside me.

“You are a fool,” he said.

“Probably.”

We sat in silence. The night passed. The stars turned overhead.

And in the morning, when I opened my eyes, the old man was gone.

The bank was empty. The mint was still there. The river still flowed.

He had found his replacement, the old man. Not in a traveler. Not in a stranger. In the judges themselves. They had seen what I had done, and they had seen what he had done, and they had made a decision.

I do not know where he went. I hope it was somewhere with rivers that have no poison in their banks.

I am still here.

The mint still grows. The travelers still pass. The boy comes sometimes to fill his bucket. He never picks the mint. He looks at it, and he looks around, and I wonder if he remembers the voice he heard that day.

I speak to him sometimes. I do not know if he hears me.

But I have learned that there are worse things than waiting on a riverbank.

There is passing on the poison to someone else.

And there is choosing not to.