With a cold mind, a passionate heart, and piercing eyes that relentlessly pursue criminals, Detective Kyoichiro Kaga never loses his warm consideration for humanity in any situation. This extraordinary detective, who has been developed with affection by Keigo Higashino for nearly 30 years while minimizing the use of series characters, is not only the author's favorite character but also referred to as his persona.

The "Detective Kaga Series" encompasses seven works that cover Kaga's university years to his time as a detective at the Nerima Police Station. In this revised edition, translator Yang Yoon-ok has extensively revised and supplemented her translation from over a decade ago. She applied the updated Korean language regulations in accordance with the times and corrected various errors in the previous editions, refining over 3,000 sentences to enhance the reading experience. Additionally, the series' unity is enhanced by the brilliant cover illustrations by artist Choi Hwan-wook, increasing its collectible value.

Volume 5 of the "Detective Kaga Series," titled "I Killed Him," is known as the ultimate whodunit alongside its predecessor, "Someone Killed Her," as the identity of the criminal remains a mystery until the very end. Upon its initial publication, the book generated a flood of inquiries to the publisher about the identity of the culprit. The story gradually reveals the identity of the murderer based on the tangled relationships among a bestselling author, who was poisoned in front of guests on his wedding day, and those around him.

A bride screaming in despair at the whims of fate, three suspects who do not hide their hatred toward the victim. Who is the culprit? Detective Kaga, in a whirlwind of love and hate, once again invites readers to uncover the truth. This work exposes the ugliness of human nature while allowing readers to dive into the case and uncover the truth themselves, awakening the detective instinct that may lie dormant within us.

In the year I decided to stay at university, Miwako and I returned to this house. She had become a college student in the meantime.
Fifteen years. That was the time Miwako and I had spent living apart. The first mistake was that we, as siblings, had lived apart for so long. The second mistake was starting to live together again after fifteen years.
_ "Chapter of Takahiro Kanbayashi" 1 / Page 14

As I turned my gaze away from me, Yukizasa Kaori cast her eyes far away. It was then that her elongated eyes suddenly widened. I felt her gasp.
At that moment, the three men, including myself, turned our eyes in the direction she was looking. Her gaze was directed toward the glass door. Beyond the lace curtains, a garden with a lawn was visible.
In that garden stood a woman with long hair, staring blankly in our direction with a vacant expression.
_ "Chapter of Takahiro Kanbayashi" 3 / Page 41

I stared at Miwako's lips. I wondered when I last tasted that sensation. And I was overwhelmed by the impulse to confirm that softness and warmth right here and now. All I could see were her lips. The heat rose within me.
Yet, I desperately tried to suppress myself. I must not force it; if I did, I could never go back for the rest of my life. Something inside me responded to that. Who knows? Perhaps falling endlessly isn't so bad?
_ "Chapter of Takahiro Kanbayashi" 1 / Page 122

As soon as I entered the house, I threw off the suffocating wedding attire. Standing in front of the mirror in just my underwear, I placed my hands on my hips and puffed out my chest, looking at myself.
Something was boiling inside me. Not knowing how to release it, I simply clenched my fists.
I had come back to life. The heart of Yukizasa, who was murdered by Hodaka Makoto, had resurrected today.
I killed him.
Did I kill him?
_ "Chapter of Kaori Yukizasa" 3 / Pages 171-172

“Oh, it’s not that great.” I chuckled. “I just liked her, and she rejected me.”
“But she must have wished for your happiness, right?”
“Of course. I’m not such a morbid person that I would wish for someone else’s unhappiness just because they didn’t choose me.”
“Then when you heard that Hodaka was leaving her to marry Miwako, didn’t something special stir within you?”
“Something special?”
“Yes.” The detective nodded. “Something special.”
I gripped the can tightly. I wanted to take another sip, but the sensation of my stomach tightening made me lose the desire to drink.
_ "Chapter of Naoyuki Suruga" 2 / Page 310

Kaga slowly raised the finger that was pointing at the photo.
“Others won’t understand what I’m saying at all. But there will be one person who understands the meaning of what I just said. And that person is the one who killed Hodaka.”
Kaga said.
“The culprit is you.”
_ "Chapter of Takahiro Kanbayashi" / Page 415