The Line Watchers is a story about Hong Kong’s customs officers. Intellectual Property Investigation Bureau Senior Superintendent Benjamin Yuen, Trade Controls Officer Mandy Wong, and Customs Drug Investigation Bureau Superintendent Venus Wong leads a group of elite customs officers and rookies. From eggs to atomic bombs, powdered milk to drugs, they are on standby on land, air and ocean as the face of the new “Smart Customs” program. This group, amidst personal adversities, is able to overcome difficulties and uphold the motto of “Commitment and Excellence,” contributing to the stability and prosperity of society and becoming gatekeepers that Hong Kongers can be proud of.

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Jingbirok, the name of a book written by real-life Joseon historian and scholar Ryu Seong Ryong, detailing the Imjin War (1592-1598). The drama will be a telling of historical events with the scholar as the central character, in the same vein as "Jeong Do Jeon" (who influenced the founding of the Joseon dynasty). Ryu Seong Ryong was an official who served during King Seonjo’s reign in the late 16th century. He was a brilliant Confucian scholar who was put in charge of military operations during the Imjin War, and greatly influenced Admiral Lee Soon Shin.

Seo Hee Soo is a university student and she wants to become a song lyricist. She has never had a boyfriend in her life and her self-esteem is almost zero. She happens to find a mysterious lyrics notebook that makes love come true for the writer. Her best friend Jung Shi Ho is the only one who knows about Seo Hee Soo’s lyrics notebook. Seo Hee Soo soon gets involved with different men.

A group of high school girls is Copper Dimension's last defense against the dark forces. They signed a contract with Xiong Ya, a guardian of light, to protect the innocent with their lives in exchange for having one wish come true. When one of their own is killed in school, their hunt for the devils in human skin brings them face to face with their own inner demon. They soon discover they are not above the influence of evil.

Den Bussaya got married with Jitree, the former miss beauty queen, but his mother disliked her, so she tried to get rid of her by looking for a new wife for him that was Duen. Duen was pregnant with her ex-husband and lied to Den's mother that she was pregnant with Den. Jitree was hurt and ran away from him to stay in Chiang Mai. Later, Jitree gave birth to Taddao and taught her to hate her father, but she didn't know that Den sneaked to meet Taddao often. Later, Den wrote his will to give Bussaya house only to Taddao and left the will with Puang, his follower to take care of it before he died. Jitree was indebted because of gambling, so she wanted to give Taddao to get married with Prince Wattana for money. Prince Yodkhwan or Prince Noi, Prince Wattana's son just came back from studying in America. When he knew that his father would get married with the young girl, he was angry and ran away from the palace to do farming with his follower. Jitree told Taddao about her father's death

Itsuki Shinonome is transferred to the Internet Media Department and assigned to a story involving green caterpillars being found in instant food. She later finds a man who has posted about this issue on social media and talks to him. A fight between companies eventually draws her in.