The Convergence.

Zhang Wei is a Thai-Chinese man who returns to Thailand to inherit an abandoned boxing gym. He learns about the relationship between his Chinese great-grandmother Xiu Ying and a top Muay Thai fighter through diary entries dated to the Thai Buddhist year 2483. As thought-provoking as the love between them is to Zhang Wei, what fascinates him more is the insight into the Muay Thai of the past Xiu Ying provided.