Is Affair coming back?

Siang Pleng and Wan Wanwiwa have grown up in the same household but with different status. Pleng is the child of the homeowner, while Wan works in the house. Although they never want to be separated, one day, Wan tells Pleng that eventually she will have to get married. Pleng plans to find a good man for Wan to avoid her being alone. However, this plan makes Pleng realize her own feelings towards Wan. While their love grows stronger, Pleng loses her parents due to a business failure and escapes, leaving only a love letter for Wan. Later, they encounter again but Wan is engaged.