Ngao Asoke

Monthai is from a rich and well respected family, and is the only son of his mother (who is the legal wife) and his father. He is also engaged and in love with the family friend's eldest daughter, Viyada. Due to Monthai's father being a womaniser with many "wives", Khun Ying Tubtim is paranoid and strict with her son as she does not want him to follow his father's footsteps. This leads to a rift between the mother and son when a housekeeper's daughter commits suicide because of Khun Ying's constant harassment, and leads Monthai to cut off from his family before leaving for Australia. This also leaves Khun Ying Tubtim extremely traumatised. Bpeeyachat, on the other hand, is a poor girl who lived in the same neighbourhood as Monthai with her sickly grandma. She is indebted to Monthai as he was very kind to her when she was a child. One day, due to an unfortunate incident, her grandmother passes away and leaves her in the care of Viyada's family. (Source: Soju at MyDramaList)