Yan Qiaoyi, Zhou Hao Yang and Dai Yuxin are officers from the Central Narcotics Bureau. With great chemistry, the trio successfully arrested a drug addict couple in an operation. Hao Yang's best friend, Lin Jincheng was an drug addict due to be released from jail today. Hao Yang caught him in a raid years ago, which left an irreversible scar on their friendship. The truth is, Jincheng covered up for his brother Jinxiong...

While investigating two drug addict parents, Yuxin and Qiaoyi discover their kid is in serious endangerment. Yuxin cannot help but recall her dark past, making her more desperate than ever to find the kid. Qiaoyi has to miss her son's birthday as a result, causing some unhappiness within her family. While arresting the addict, she sees her son Yongkang idling at the same claw machine arcade. She has no choice but to go after the suspect...

Qiaoyi quarrels with her husband who blames her for neglecting the family. Her husband initiates a divorce to her surprise. Meanwhile, CNB starts to investigate an ex-abuser named Uncle Chen. Yongkang tries to persuade Yuxuan to quit drugs. He follows him to a hair salon but sees Hao Yang there instead. Knowing his mum is looking for him, Hao Yang chases after him, Yongkang has no choice but to run...

Yuxin finds Yongkang and tries to persuade him to understand his mum. Yongkang nearly forgives her, but Qiaoyi flies into a rage without hearing him out, resulting in a bigger rift between them. Uncle Chen is suspected of drug trafficking, but Jincheng does not know that, and continues to help him adapt to a drug-free life. Hao Yang discovers they are friends and tries to test out their relationship, angering Jincheng...

Pursued by Amos, Yongkang and Yuxuan have no choice but to seek help from Yongkang's uncle Zhang Zheng. Qiaoyi finds him at his uncle's house and forces him to do a urine test. Yongkang is humiliated which further aggravates their relationship. Jincheng discovers his brother is still taking drugs. Jinxiong swears he has mended his ways and promises to quit. CNB pursues Uncle Chen but he accidentally dies instead...

Jincheng does not dare to face Hao Yang after taking drugs. Hao Yang attempts to reconcile with him, which makes Jincheng even more guilty. Hao Yang finds a doll amongst Uncle Chen’s belongings and suspect a claw machine arcade owned by Amos. Jincheng realizes his brother is trafficking drugs. Not wanting to be like his brother, he tries to quit drugs but fails bitterly… 金城因吸毒，心虚不敢面对浩洋。浩洋频频示好，令金城更加愧疚。浩洋在陈伯的遗物中发现玩偶，查到夹娃娃店有嫌疑，开始调查Amos。金城发现哥哥不仅吸毒...

Zhang Zheng discovers Yuxuan is a drug addict, but he promises to keep this as a secret for Yongkang. Qiaoyi and her husband unites to bring their son home together. Yongkang finally tells the truth to his mother, but Yuxuan disappears all of a sudden. When he was found, Yuxuan has already been viciously attacked and falls into a coma. CNB follows Amos and finds him taking drugs. As they are about to question him...

CNB follows the clues left behind by Amos and discovers Jinxiong might be involved. Meanwhile, Jincheng finally admits to his wrongdoings and tells Hao Yang the whole truth. As a result, his brother is arrested, revealing Zhang Zheng to be the mastermind. Zhang Zheng tries to run away with Yongkang as his hostage. When CNB tries to stop him, he jumps into the sea and disappears...