Tian needs a sudden heart transplant, and fate hands him the heart of Torfun; a volunteer teacher. He takes over her role as teacher and meets Chief forest officer Phupa, and their relationship begins to bloom.

A volunteer teacher dies in a tragic accident, in which her heart is was transplanted to Tian. Through a series of diary entries, Tian learns about her life; her secrets and interests. Including her promise to Chief Forest officer Phupha, about counting a thousand stars with him. Tian then decides to follow in her footsteps and complete her dream. With Tian, a new volunteer teacher, he attempts to befriend Phupha. Yet, Phupha gives off a cold exterior. Slowly the two are growing close and Tian's heart beats fast around the forest officer. He starts to fall for him, much like its previous owner did. But with the area being dangerous, can they keep their thousand-star promise?—Vorachote Sakulsri