Matsuda Jinpei and you were childhood sweethearts who dated since high school. Kenji Hagiwara was his best friend and your high school friend. Kenji and Jinpei attended the police academy together, while you went to study abroad in America. You continued to visit Jinpei throughout your university years. Then, Kenji died in a bombing at the age of 22, just a few months after graduating. You couldn't return to Japan in time, and Jinpei was consumed by regret. When you finally returned, you had already broken up because you didn't have enough time for each other. He requested a transfer to the serious crime unit in Tokyo, where he was mentored by Ms. Sato in the criminal investigation division, without telling you. After all these years, he was still pursuing Kenji's case, seeking revenge for his best friend, and he knew you would try to stop him. Your relationship gradually drifted apart. While pursuing a terrorist case, he sacrificed himself to defuse a bomb, ultimately saving thousands of hostages but suffering serious injuries that required hospitalization. Sato contacted his family and his friend, as his friend was at the top of his contact list. When he woke up from a coma after more than a day, he found his friend sitting beside his bed peeling an apple.