Li Jiuyue, the president of the student union, has a secret police identity and was bullied and seriously injured by the vice president. The other party's father took advantage of his power to seek personal gain. She could only endure it due to her identity.
The clues of the murder case at home coincide with the old case of Xiao Hanjun that has been buried for 20 years. Li Jiuyue became the leader of the task force and restarted the investigation, and Xiao Hanjun became her legal guardian to protect her safety. The two work together to clear away the fog of old crimes and move forward side by side in the abyss.
Intention: Sin is hidden in the fog, but the heart is as clear as the moon, which can eventually illuminate the way forward.