After suffering a fall from grace, a photographer returns to her hometown and bumps into her childhood friend — rekindling an unfinished romance.

Living next-door to each other, catching the bus together, studying in the same room, Som-O and Chadjen were close from childhood. One day, Chadjen's father passes away and his mother goes on to remarry, relocating to France. Because Chadjen doesn't want to move with her, he ends up living with Sam-O's family.

On entering high school, the two get to know new friends including New and Khao. The kind pair are always helping and advising Sam-O with her love life. One day a new kid—a swimmer—named Tao comes into the picture. Whether their studies or extracurriculars, the group get through thick and thin together, forming a bonded group.

Years on, everyone has dispersed through different faculties of the same university.

The love story of childhood friends Yi Yao and Qi Ming.

Suea and Mook had known each other since young age, they grew up together and had unsaid promise of undyingly loving each other but their separation was inevitable since Mook's father had to move abroad for his career. They eventually got together because Mook had to return to Thailand for a funeral, and it was then that they met after almost 10 years. Their happiness wasn't easily earned, there were many people wanting to take advantage of Suea's fortune, and had to get Mook out of the way.

Srijan was the mistress of Ah Tong—heir of the wealthy Phetchamekha family—and gave birth to his eldest son Sun. However, because she was only a housekeeper, she was despised by the whole family, especially his mother Madam Pei Ing. Offered a large sum of money in exchange for her son being raised by his legal wife, she accepted it before running away with her son. Srijan raises Sun with hatred, lying to him that his paternal family had rejected him and chased them away, filling him with a desire for revenge, all the while hoping he will someday take over the Petchamekha family and make them bow to her. Today, Sun's revenge begins. He plans to seduce his half-brother Yang's girlfriend Chatwarang, expose his youngest half-brother Fu's sexuality and have his father accused of serious crimes. Amidst all his revenge, though, he doesn't realise that he might lose not only his soul but Nam, his childhood sweetheart.

Tightrope tells the tale of the reluctant heir of a yakuza family and his childhood friend, and follows their love relationship that started budding in their school days and keeps developing slowly but surely.

A girl who lies the biggest lie of her life to protect her first love.

A boy who doesn't recognize her like that of her and waits for the day when she will become an idol of her own dream.

What is this unfamiliar feeling that rises between the two as they solve an unexpected crisis together?