He's Coming to Me

On his birthday, Med, the kind-hearted heir of a rich family, dies mysteriously and becomes a ghost. For twenty years, he waits in the graveyard for someone to visit so that he is able to reincarnate. However, his plan for reincarnation changes completely when he spots Thun, a young boy who is able to see and talk with him during every Ching Ming Festival.
A few years pass and Thun, now a university student, grows suspicious about Med's death. He promises to discover the circumstances of Med's death and takes Med to live with him. As they solve the riddle of Med's death, the boys find themselves falling in love with each other despite the certainty that one day they must part.
(Source: MDL)
~~ Adapted from the novel "Khao Ma Cheng Meng Thi Khang Khang Lum Phom Khrap" (เขามาเชงเม้งที่ข้างๆ หลุมผมครับ) by larza.