That year, she was a young girl who entered the police academy for the first time. She was cheerful and bright, and she didn't know what sorrow was. That year, he was the senior who silently protected him, calm, considerate, and tolerant. They were meant to be happy and happy for a long time. But because of a case, he became a lingering pain in her heart. Time has passed, can she get out of the shadow of the past?