After volunteer teacher Torfun dies in a tragic accident, her heart is transplanted to Tian. Through a series of diary entries, Tian learns about Torfun’s life, secrets, interests, as well as her promise to count a thousand stars with Chief forest officer Phupha. Tian, as the new volunteer teacher, attempts to befriend Phupha, but the latter is initially cold to him. As the two slowly grow closer, Tian’s heart beats fast around the military officer, and he starts to fall for him, much like his heart’s previous owner did. Treading on dangerous territory, can the two keep their thousand star promise?