Siangphleng and Wan Wanwiwa have grown up in the same household but with different statuses. Phleng's the child of the homeowner while Wan works in the house. Although they never want to be separated, one day, Wan tells Phleng she'll eventually have to marry. Phleng plans to find a good man for Wan so she won't be alone, however, this plan makes her realise her own feelings for Wan. While their love grows stronger, Phleng loses her parents due to a business failure and escapes, leaving only a love letter for Wan. When they eventually meet again, Wan is engaged. (Source: iQIYI; edited by MyDramaList) ~~ Adapted from the novel "Affair" (AFFAIR : รักเล่นกล) by Chao Planoy (เจ้าปลาน้อย).