The summary is:
Bunga is a young woman who lives with her grandmother in a rubber plantation. They are in debt to a gangster named Wieng, who wants to take Bunga as his wife. Bunga escapes on a train, where she meets Tawan, a kind-hearted man who helps her. They end up working at the same hotel in Krabi, and fall in love. Tawan is the son of a wealthy businessman, but he left his family to pursue his own dream of opening a tea shop. He also has half-siblings who are greedy and hostile to him. Bunga learns that her grandmother is sick, and decides to go back home. Tawan follows her, and they face Wieng and his men, who try to capture Bunga. They manage to escape with the help of Tawan's brother, who is a doctor. They promise to stay together and take care of each other.
Here are the key facts extracted from the text:
1. Bunga is a young woman who lives with her grandmother Kimluan in a rubber plantation village.
2. Kimluan owes money to Wieng, a local gangster who wants to take Bunga as his wife to settle the debt.
3. Bunga escapes from Wieng's men on a train and meets Tawan, a kind-hearted man who helps her.
4. Tawan is the illegitimate son of Jaturong, a wealthy businessman who runs a trading company in Bangkok.
5. Tawan wants to open a tea shop in Krabi and falls in love with Bunga.
6. Bunga works at a hotel owned by Chief Inthu, who also owns a swallow's nest mine on Koh Burong island.
7. Kimluan falls ill and Bunga returns to her village with money from Chief Inthu to pay off the debt.
8. Wieng finds out about Bunga's return and tries to capture her again, but Tawan follows her and fights off Wieng's men.
9. Bunga and Tawan escape together and board a train to start a new life.