A volunteer teacher dies in a tragic accident, and her heart is transplanted into Tian. Through a series of diary entries, Tian learns about her life, her secrets and her interests. Including her promise to the military officer Phupha to count a thousand stars with him. Tian therefore decides to follow in her footsteps and fulfil her dream. Tian, as the new volunteer teacher, tries to befriend Phupha. However, Phupha comes across as cold. Slowly, the two grow closer; Tian’s heart races whenever she is near Phupha, and she begins to fall in love with him, just like her previous owner did. But with the war-torn and dangerous territory, can they keep their promise to count a thousand stars?