A modern young woman, Chu Wanwan, accidentally transmigrated into a classical romance story, becoming a supporting character with a rugged fate. To protect her close friend and emperor, Xiao Yu, whose identity is hidden, she originally planned to seek help from a general, but by a twist of fate got entangled with an old acquaintance, Xiao Chi. Harboring misunderstandings from their early years, conflicts constantly arose between them as they got along. Accidental falling off a cliff and being trapped in a valley, their companionship from dawn till dusk slowly untied each other's emotional knots. Undercurrents surged in the imperial court, with powerful officials intending to monopolize power. To protect the people and those around them, the two put aside their estrangement, planned side by side, joined hands to resolve wave after wave of crisis, broke free from the predetermined tragic fate, accompanied each other in both directions, and reaped a fulfilling ending.