It tells the love story of Lu Jin Nian (Dylan Xiong) and Qiao An Hao (Li Xi Rui) spanning 13 years. They first got to know each other in school, but later parted ways again due to some misunderstandings.

In the final days of World War II, occupying Japanese forces in the Philippines face resistance from the local population and the American offensive. The dwindling Japanese soldiers attempt to survive through the horrors of war.

Celica is the daughter of a wealthy family. Her father owns a big house and has lots of money. However, they are living in a small house at the country side and they plan to move. Tewada's family wants to go first to prepare the new house for Celica's family, which only includes her dad and herself. When Celica and her father are on their way to the new house, some assigned bad guys try to kill them and Celica's father dies. Before he died, he burned his daughter with a symbol stamp to represent that she is his daughter. Tewada's family thought that both of them died and they pretended that Tewada is Celica's father's son in order for him to get the inheritence. Tewada doesn't know anything because Celica's father has always treated him as a son. On the other hand, the mayor of the town decides to raise Celica, until she is old enough to go back and fight for her rights. He changed her name so that the bad guys won't be able to find her again. Years later, Celica and Tewada are both grown up and they meet again.

Oh Soo Min (Yun Woo Jin) is a dutiful young Catholic priest, filled with energy. He is a member 643 Regia. The group performs exorcisms unofficially. In the past, his own mother was possessed by a devil. She could not receive an exorcism and she consequently died. After that, Oh Soo Min was taught by Priest Moon Ki Sun (Park Yong Woo) (whose formed 643 Regia) on how to perform exorcisms. Meanwhile, Ham Eun Ho (Jung Yoo Mi) became a doctor after her family went through an unfortunate accident. She wants to save people's life. Now, Ham Eun Ho works in the emergency room of a hospital. she does not believe in God, but she witnesses a supernatural phenomenon and meets Priest Oh Soo Min. Ham Eun Ho faces a big change in her life.

A story about Chong'er's unwavering determintion for the sake of his country and the emotional sometimes heart-wrenching relationships formed with Qi Jiang, Li Ji, Ying Yue and Ji Wei. . Chong'er loves his country and has thought of many ways to help the people. However, he becomes the victim of a conspiracy cooked up by corrupt officials.

A young Cambodian man who has been trained to fight for money in his country is hired to kill someone in Hong Kong. He performs the hit and then flees from Hong Kong police, who are wrestling with internal problems of a model cop and his son, who is also on the force and who was told by his dad not to become a police officer. The father goes into a coma after being shot, and internal affairs suspects him of dealing drugs on the side. The assassin then befriends a young girl who is molested and abused by her father. They both plan to get back on a ship to Cambodia but have to get past Hong Kong police, who do everything they can to catch him.

"Sai Roong" speaks of memories and the steadfast love of a young woman named Maythinee for a man whose name she calls out whenever she dares to feel, for her lover, Pak, who died in a car accident after her mother forced her to write him a breakup letter.

Her lover is gone and the memories of the past, no matter how beautiful, can not come back.

All Maythinee can do is drown herself in alcohol and try to forget. And perhaps also endure the heartbreak of suddenly seeing her dead lover's face in another man.

However, it is unknown to her that the man with her dead lover's face is indeed her dead lover, Pak, who is still alive and living under a new name, Ponsithon.

While Pak had loved her, Ponsithon is still burning in the flames of betrayal until his only desire is to get revenge.

Sai Roong, meaning Rainbow, speaks of memories and life lessons. It shows the value of love and prayer.

Because no matter where the end of the rainbow is, and no matter how out of reach it may be... for the feelings that are so dear to the heart, travelling till the end is nothing hard at all.