Paen Rai Long Tai Warak

The story

Fah grew up with her adopted siblings, Tawan and Dao, and they promised to always be there for each other. When Tawan is tricked into marrying Pink who is pregnant by another man, he asks Fah for help. Instead, their plan backfires and Fah winds up marrying Neung, Tawan's uncle-in-law.