Mei Fang awakens in 2002 as a six-year-old boy, his consciousness thrust back twenty years to a moment of childhood embarrassment—wetting the bed during naptime. Yet this humbling return grants him an extraordinary gift: the chance to reclaim the bonds he carelessly abandoned in his previous life. Three children make a sacred vow beneath the afternoon sun: "Will the three of us stay together forever? Always best friends?" "Pinky promise. No takesie backsies. For a hundred years." What begins as innocent childhood play evolves into something far more complex. The well-behaved angel transforms into a spirited troublemaker. The wild, mischievous girl matures into a composed, brilliant student. The serene boy develops depths of unexpected charm. Day after day spent in each other's company reshapes their souls, their dreams, their very identities. Years blur into one another as they navigate the threshold between childhood wonder and adolescent awakening. Three hearts that started as one now beat to different rhythms—yet something fundamental remains unchanged, an attraction neither time nor circumstance can erase. In their laughter and banter, in stolen glances and unspoken confessions, a harem of genuine affection takes shape. No pretense. No hesitation. Only the fierce, unguarded devotion of those who've loved each other since the very beginning.