Jay (Toomtam) and Ploy (Mo) are boyfriend and girlfriend. Ploy is friends with a girl named Toey. Toey is dating a guy named Karn. A third girl, Pin, becomes involved in Toey and Karn's relationship. Toey gets cheated on. Ploy goes to talk to Pin, who is accused of being the third hand, and it turns out that she's actually too prim and proper to do such a thing, so the two become friends and grow closer. However, Ploy is still suspicious if she's a good person or not, so because she is so confident in her relationship with Jay and their love, she convinces him to try to court/date Pin to prove whether she's really innocent or not. Should love be something to test like this? Find out in "Ruk Long Jai".

Why would a woman return to her sleepy hometown after 18 years?

Yang Baek Hee was quite popular in her small hometown of Sumwol Island but left 18 years ago under a shroud of scandal when she became pregnant. In the intervening years, Baek Hee has married a doctor and become a polished, top salesperson for a home shopping network. When she moves back to Sumwol Island, Baek Hee brings her 18-year-old daughter, Shin Ok Hee.

The rebellious Ok Hee thinks her mother is the pinnacle of uncool. But she begins to see her mother in a new light as she learns about Baek Hee’s past on the island.

When Ok Hee meets three men from her mother’s childhood — Woo Bum Ryong, Cha Jong Myung and Hong Doo Shik — could one of these men be her father?

The drama tells the story of the housewife Bai Ying Ying who is disheartened by her marriage life after discovering that her husband Ding Zhi Yuan cheated on her with her friend Gu Fei Er. She then finds out many unclear points connected to her sister Bai Jing Jing's suicide. While escaping from Gu Fei Er, with the help of Jiang Chuan, Jin Rui and other friends, Bai Ying Ying tries to open a new chapter in her life.

Jiang Yi Yi is a graduate student majoring in artificial intelligence. Ever since her twin sister passed away, she has been carrying a sense of guilt and has been determined to develop an AI that can "resurrect" her sister. This led her to be enter the world OG "Al Guru", Gu Yu.

Gu Yu, althouth hailed as a master in the field of AI, has a little-known mental illness. He has been searching for his childhood "Green Plum" to cure his illness, but by coincidence, he found Yi Yi, the older sister of his "Green Plum".

These tw "romantic fools" who should not haven fallen in love, gradually grew closer to each other during their joint research project, at their values aligned. As they helped each other solve problems, the seeds of love began to sprout.

Reiko Akutsu (Reina Triendl) works for a residential construction company. She plans a lunch matchmaking meeting to find love with someone in the same company. New employee Yuika Amano (Mizuki Yamamoto) offers to join the matchmaking event. Yuika Amano and Reiko Akutsu hold the luncheon and meet two men. During their lunch, Yuika Amano and Reiko Akutsu hear a story filled with riddles by the two men. Yuika Amano can't help but to solve the riddles. Going forward, during their lunch matchmaking meetings, Yuika Amano hears various stories involving things like ghosts or missing people and she attempts to solve the mysteries.

~~ Adapted from the web novel "Kong Que Cheng Xia Xiao Qing Yi" (孔雀