The Blood Oath

The most dangerous thing about revenge is not hatred. Hatred is simple because you know who you hate, why you hate them, and where to direct your anger. But doubt is different. Doubt enters quietly. It sits beside you while you drink coffee, follows you when you walk home, and whispers when you look into the eyes of someone you trust. And my doubt had a name—Kai. For five years, I had created a perfect revenge plan. Every movement was calculated, every person investigated, and every possible mistake removed. I knew the weaknesses of the Kurogane family better than they knew themselves. But I never planned for one thing: falling in love with someone connected to my enemy. That was never part of my strategy. That was never supposed to happen. Yet there I was, standing outside Kai’s apartment, staring at the door like it was the entrance to a battlefield. Because maybe it was.

When the door opened, Kai appeared wearing a ridiculous dinosaur hoodie. I stared at him in disbelief. “You know you’re supposed to look mysterious when someone is having an emotional crisis, right?” I asked. He looked down at his clothes and said, “What? You don’t find a dinosaur terrifying?” I told him I didn’t, and he immediately joked that I had never seen his dance moves. Even in the middle of my collapsing world, he still managed to make me laugh. That was Kai’s power. It wasn’t magic or strength. It was something much more dangerous—he made people forget their pain. He invited me inside, and as I entered his apartment, I noticed how different it was from my life. Books were scattered everywhere, paintings covered the floor, unfinished drawings rested on tables, and random objects filled every corner. It was messy, but it was alive. It was a normal life, something I had lost long ago. Kai looked at me and said, “You’re thinking too much again.” I asked if I really did that often, and he laughed, saying I stared at walls like they owed me money. I almost smiled, but then I remembered why I came.

“Kai,” I said seriously. His expression immediately changed because he knew my serious voice. I placed the picture of the man who destroyed my family on the table. The moment Kai saw it, something changed on his face. It lasted only for a second, but I noticed. Fear. Recognition. Pain. Then he quickly hid it. “What?” I asked. “Nothing,” he replied. But I knew he was lying. “Don’t lie to me,” I said. He looked away and whispered my name. I told him I had seen his reaction, and silence filled the room. Then another voice appeared. A colder, sharper voice. “You always were too observant.” I froze. Kai’s entire presence changed. His eyes became different, his posture became colder, and Kian appeared. The difference between them was terrifying. Same face, but a completely different person. Kian looked at me calmly and told me I should stop digging. I asked him why, and he replied that some graves were better left closed. I stepped closer and told him that I decided what stayed buried. Kian smiled dangerously and warned that my attitude would get me killed. I answered that his attitude would get him abandoned. For the first time, Kian looked surprised. Then he laughed. “You’re interesting, Ren,” he said. I told him I wasn’t trying to impress him. He replied that was exactly why I did. I hated that he was right.

The following weeks became a strange balance between love and war. During the day, I hunted information about the Kurogane family. At night, I spent time with Kai. I was living two different lives with one heart. Kai knew I was hiding something, but he didn’t know how deep my secrets went. One evening, we went to a street festival where the entire city seemed to glow. Lanterns decorated the streets, music filled the air, and people laughed without fear. For a few hours, I forgot about revenge. Kai bought an impossible amount of food and claimed he could finish everything. I told him he had bought twelve different desserts, but he simply said he had emotional problems. I told him that wasn’t an excuse, and he replied that it was in his heart. I shook my head and called him impossible. He smiled and said, “And you like me.” I became silent. The teasing disappeared from his face as he looked at me seriously. “Ren… do you?” he asked. The question was simple, but it felt heavier than any weapon. I looked at him and finally admitted the truth. “Yes.” His smile became smaller, softer, and more real than usual. He told me he was relieved because he thought he was embarrassing himself alone. I laughed and told him he flirted like he was fighting. He replied that the result was the same because someone always lost, usually him. For that moment, we were not enemies, victims, or broken people. We were just two souls finding happiness in a world that had taken too much from us.

But happiness never lasts forever. That night changed everything. When I returned home, I found my apartment destroyed. It wasn’t a robbery. Someone had broken everything just to send a message. On my table was a black envelope. Inside was a single sentence: “Stop chasing the Kurogane family, or your pretty little secret will disappear.” My blood turned cold. They knew about Kai. Someone knew. I immediately called him, but there was no answer. I called again, but silence remained. For the first time in years, I ran without thinking. Revenge was important, but Kai was more important.

I found him in an abandoned warehouse near the river. Three men surrounded him, and standing in front of them was the person I had spent five years searching for—Akira Kurogane. He looked older than the photographs I had studied, but his smile was exactly the same. The smile of someone who believed he was untouchable. “You finally came,” he said. I walked forward and asked if he remembered me. He smiled and said, “How could I forget?” His eyes moved toward Kai, and he said that this was unexpected. My fists tightened as I demanded to know what he had done to him. Akira laughed and said I still didn’t understand. Kai looked at me, fear filling his eyes. Not fear for himself, but fear for me. “Ren, leave,” he whispered. I refused. He begged me, but I refused again. Akira smiled and said my stubborn expression reminded him of my father.

The mention of my father broke something inside me. I attacked. The fight became chaos. I was not stronger than them, and I was not faster, but anger gave me a different kind of strength. Every movement carried five years of pain. Every strike carried memories of everything I had lost. I fought like someone who had already lost everything once and had nothing left to fear. Then Kian appeared. Not Kai. Kian. He moved differently—calm, precise, and almost impossible to predict. The men surrounding us were pushed back as I watched him fight. “Kian…” I whispered, but he ignored me and told me to focus. Together, we fought. I fought with rage, while he fought with control. We were completely different, yet somehow perfectly matched. When the fight ended, Akira escaped, but he left something behind—a file.

Inside the file were documents, photographs, and records. My hands started shaking as I read the truth hidden within those pages. The person who destroyed my family was not Akira Kurogane. He was only following orders. The real mastermind was someone else. Someone I knew. Someone close to me. Someone who had been beside me the entire time. The final page contained one name.

Kai Arata.

I stopped breathing.

No.

It couldn’t be true.

Kai was not my enemy. He was the person who made me smile. The person who brought light back into my life. The person who reminded me that I was still human. But the evidence was there. Behind me, Kai whispered my name. I turned around and saw tears in his eyes.

“Ren… I can explain.”

And for the first time since I met him, I was afraid of the person I loved.

Because maybe my greatest revenge was never against my enemy.

Maybe it was against the person standing right in front of me.

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