"In a race against time, two unlikely partners must unravel a web of mystery and confront their demons to find the truth." Jiang Yuze and Liu Haoran were best friends. They were inseparable until Haoran suddenly disappeared without a trace. Yuze blamed himself for not protecting Haoran and he was desperate to find him. Zhang Xinyan is a secret heiress for a large company. She passed her civil exam with honors. After graduating from the police academy, she was eager to work as soon as possible. When she was young, a police officer saved her and that inspired her to help people when they're in trouble, but she had another mission in mind. Ten years later, Yuze became a police officer after his father sacrificed his life to save him. He is very intelligent and book smart. But sometimes, he will struggle to befriend people because of his icy exterior and stern facial expression. Xinyan was required to partner up with Yuze, who did not oppose, but let her follow him wherever he goes. Xinyan initially struggled to keep up, but she continued because if she gives up, she will never find the real reason behind her older brother's death. During their interactions, Xinyan learned many useful things. Xinyan wanted to understand Yuze and his backstory. But the sudden appearance of an old friend, who wasn't kind-hearted anymore but came back as a killer.