The Naga king's promise

Vuthy does everything to live another day by working hard while doing his schoolwork diligently. When the schoolwork that he had been doing was gone, he was devastated and depressed. Suddenly a goddess appeared out of nowhere! She who is above him said she’s here to fulfill her promise to him…. what promise? Is he losing his mind due to stress?? Ever since that moment, his life had changed, for better ….or worse.