ทะเลสาปสีเลือด

Thalaesap Si Lueat (The Blood-Red Lake): Following the suicide of her father, Natcha, due to a business failure, Natcha, her mother Nonglak, and her younger sister Nongnut are forced to move from their mansion into a rented shophouse. Natcha begins searching for a job to support her family and applies at the real estate firm owned by Daran, a promising young businessman.
There, she encounters Kulacha, a rival from her student days. Seeking revenge, Kulacha uses her connection to Songphop—the managing director and Daran’s uncle—to hire Natcha as her personal secretary. However, Songphop takes a liking to Natcha and appoints her as his private nurse instead. Songphop’s blatant favoritism makes Daran immediately dislike Natcha, leading to constant bickering between the two.
As Songphop’s birthday approaches, he plans a celebration at "Phu Dara Resort," a lakeside retreat he built for his retirement. The resort sits beside a stunning lake that turns from emerald green during the day to a haunting blood-red at sunset. Local legend says a couple once drowned there in a whirlpool while fleeing from those who opposed their love, staining the water red.
The guests include:

• Thakdanai: Songphop’s second brother and Daran’s father.
• Thiphanan: A sister whose every business venture has failed.
• Thossaphon: The youngest brother, along with his children Thossaporn and Thicha.
• Kulacha: Who joins hoping to secure a future with Daran.

At the resort, Natcha meets Chaikorn (the manager), Pa Tha (the housekeeper), and Khanchit (the chef). During the preparations, Songphop suddenly suffers a heart attack and dies. While most are grief-stricken, Thiphanan and Thossaphon are delighted at the prospect of an inheritance. They attempt to rob Songphop’s safe, only to be terrified by what looks like his ghost standing behind them. In reality, Songphop had faked his death to test the loyalty of his family.
However, during the actual party, Songphop mysteriously vanishes. Natcha suspects Daran, as she saw him with Songphop last. She asks Chaikorn to take her out on the lake to investigate; while there, she falls into the water and is horrified to find Songphop’s actual corpse weighted down at the bottom of the lake.
Natcha is convinced it was murder. Greedy for the estate, Thiphanan and Thossaphon push to open the will, but they are thwarted: the will can only be read once the killer is caught. Back in Bangkok, Natcha enlists the help of Mokhasak, a crime reporter. She suspects Daran had a motive—revenge. Years ago, Daran’s college sweetheart, Kaew, left him to become Songphop’s mistress.
Was this tragedy Daran's revenge? How will Natcha uncover the truth? Find out in Thalaesap Si Lueat.