Boundary tells the story of the Thai-Cambodian conflict through accounts of an ex-soldier who lives near the border, as well as villagers from the two countries. It also touches on other conflicts in Thailand, including the 9-year-old insurgency in the south and the political divisiveness that led to a deadly military crackdown on protesters in 2010.

Lurking among us are the Horrors, ancient enemies of our kind. Holding the line against them, down through the ages, are the Makai Knights. Assuming the aspect of Golden Knight Garo, Raiga Saezima has vanquished one such demonic creature, but his magical armour has been tainted with evil. Furthermore, a Knight of the dark has materialized, and taken hold of Mayuri, so dear to Raiga. If he hopes to rescue her, Raiga must board a mysterious train destined for the netherworld. As he advances through the cars of this train, Raiga comes ever closer to confronting his own hidden truths…

Eun Shi Yeon is a police officer and she was demoted to the hit-and-run task force at a police station from the regional investigation unit at the National Police Agency and will work alongside Seo Min Jae, who is the ace officer of the hit-and-run task force. The two will be working to chase down Jung Jae Chul, who is a former Formula One racer now committing crimes with his madness for speed and cars.

29-year-old Me Sook is the most unpopular teacher at school. She used to be a Russian language teacher at a high school but was relegated to a middle school to teach English which she can't even understand. She also has a chronic blushing problem, often afraid to even lift her face up. But to top it off, she is in love with another married teacher, Mr Seo, and believes that he feels the same but is just too shy to show his feelings.

So when she finds out that he's having an affair with an attractive Russian teacher who took her place in high school, Me Sook decides to take action. Hiding her true intentions, she forms an alliance with Mr. Seo's daughter, Jong Hee, the most unpopular student at school. Jong Hee cooperates with Me Sook to save her father's marriage. They plot ways to separate the lovebirds, becoming friends in the process and also slowly falling into their own trap.

Shikata Atsushi, Tadokoro Keita, and Kawabata Satoshi spent their childhood days as friends. As adults, they meet again due to a murder case. Atsushi works as a detective, Keita is a suspect and Satoshi is a victim. As they come face to face with the truth of the murder case, they must also confront their detested past, sealed within their minds until now.

Nozomi Kuroda is in the 2nd grade of high school. One day, she finds a letter in a classroom desk. The letter has only the word "like" written on it. The person who wrote the letter is Jun Setoyama. He happens to be the most popular boy at the high school. Nozomi Kuroda feels embarrassed, but she eventually leaves a reply in a shoe closet at school. This is how their secret exchange diary begins. Nozomi Kuroda soon learns that the intended recipient for the first letter was her best friend. Nevertheless, Nozomi Kuroda is attracted to Jun Setoyama, who expresses his thoughts and feelings unlike her. She's unable to tell him the truth that the person exchanging messages is her and not her best friend.

Mary Cordery (Taylor) is a Canadian who has come to Japan for a report that she is doing at university on Japanese artisans’ skills. She has an intimate knowledge of Japanese culture, and is especially infatuated with artisans. Their skills...

Hye-Joong (Jung So-Min) can't remember anything before the age of 4. Every night she experiences terrible nightmares. Unable to cope with the nightmares anymore, she heeds the advice of a shaman and goes back to the villa where her family...