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Childhood friends Junxi and Han Tuo have grown up side by side, sharing dreams, secrets, and an unspoken bond that deepens as they enter adulthood. When Han Tuo finally confesses his long-hidden love, their friendship shifts into a fragile romance tested by family pressure, career expectations, and the fear of losing each other. As Junxi struggles with harassment at work and Han Tuo faces demands to abandon his architectural dreams, the two must confront what they truly want. The Last Promise weaves their journey into a more emotional, cinematic arc, blending new scenes with their story of first love, courage, and the vow that could either bind them together or become their final goodbye.