Jom is a young architect overseeing the renovation of an old house in Chiang Mai. However, during this project, Jom starts to have strange and frequent dreams about himself and a mysterious man from the past. Soon, Jom faces heartbreak when his boyfriend suddenly decides to end their relationship. In a moment of distress, he drives recklessly and ends up in an accident, plunging into the Ping River.

Beyond the natural order of things, Jom emerges from the water to find himself in 1927. There, he encounters the man he dreamed about, Khun Yai, the middle son of the owner of the Plathip Mansion which he'd been renovating. Jom must now adapt to this unfamiliar environment and lifestyle and the challenges of shaping a relationship with Khun Yai, someone to whom he feels deeply connected despite never having met before.