Secret

The primary timeline is in 1999, focusing on Xianglun’s final year at Tamkang and a graduation performance. The story reveals a time-travel mystery through the mysterious score 'Secret', with key memories and events shown from a past era. A crucial backstory unfolds from 1979, revealing how Xiaoyu traveled twenty years into Xianglun’s world.

A prestigious campus where Xianglun enrolls in the school’s music program, housed in an aging piano building that is set to be demolished on graduation day. The campus atmosphere blends rigorous practice with adolescent romance, rivalries, and the pursuit of musical excellence. The old piano room becomes the focal point of the mystery, linking present events to a hidden past.

🕰️ Time Travel

Time travel is the central engine of the plot, enabled by the mysterious score 'Secret' that allows movement across decades. Xiaoyu’s intermittent appearances across time create a romance that defies ordinary timelines and raises questions about fate and memory. The rules—being visible only to the first person she sees—draw out suspense and shape how the lovers interact. The demolition of the piano building becomes a symbolic deadline for uncovering the truth.

💞 Love

Romance drives the narrative, weaving together a connection that spans decades and defies disappearance. Jealousy and miscommunication test Xianglun and Xiaoyu, especially as Qingyi competes for Xianglun’s affection. The emotional stakes are heightened by the time-travel element, making absence and reunion central to the relationship. Ultimately, love endures through memory, distance, and the passage of time.

🎼 Music

Music is the language that binds characters across generations, centered on the enigmatic score 'Secret'. The old piano and practice rooms serve as a conduit for revelation, with performances marking turning points in the plot. Playing the score at the right tempo unlocks time travel and clarifies relationships and misunderstandings. Music thus functions as both narrative device and emotional compass for the protagonists.