The Edge of Horizon - Season 1

Prince Tinnakorn and Phob, the nursemaid's son, have been inseparable since childhood. Though they are warned never to cross the line between master and servant, their forbidden first love quietly begins to bloom.

Tinnakorn and Phob's relationship is accidentally discovered. Determined to end their forbidden love, Phob's nursemaid mother decides to take him away from the palace.

After the royal family discovers Tinnakorn and Phob's relationship, Phob is banished from the palace, while Tinnakorn is forced to keep everything a lifelong secret. Eleven years later, Tinnakorn has become His Majesty's Principal Private Secretary, and Phob returns to Siam from France as an army captain.

Phob is assigned to assist with security for the royal celebration, using the mission as a way to get close to Tinnakorn again. Meanwhile, a political struggle that could shake the royal regime begins to unfold in secret.

On the day of the royal celebration, tensions reach a breaking point as the progressives secretly plot a coup. Standing on opposing sides, Phob and Tinnakorn are drawn into a life-or-death crisis.

Tinnakorn and Phob's secret relationship is discovered by Tinnakorn's father, who demands they separate for the sake of the family's honor. Meanwhile, the Siamese Revolution erupts, bringing a sweeping transformation to both their love and the nation's ruling power.

The Siamese Revolution succeeds, and Phob becomes one of those who helped overthrow the old regime. As the royal family loses power and the Varakulvatin family faces political reckoning, Phob desperately tries to win Tinnakorn back—only to receive a final goodbye.

As the royal family suddenly collapses, Tinnakorn and Phob's relationship reaches an impasse. Standing on opposing sides, the two are forced apart.