Tawan Tor Saeng (Eternal Sunshine)

This is the story of Pakapong, a young man who has it all in terms of wealth and status but completely lacks love. Filled with deep resentment because his mother abandoned him, he despises women and is firmly convinced that no one is ever truly sincere with him.
Meanwhile, Rasa is a talented and successful interior designer. Although she was orphaned at a young age, she grew up surrounded by the warmth of her father's friend's family and her only remaining aunt, who took care of her while she attended university in Bangkok. Cheerful, kind-hearted, and optimistic, Rasa is assigned the job of decorating Pakapong's house.
When the two first meet, they constantly clash and bicker. However, as time passes and they get to know each other, Pakapong begins to realize that Rasa is the radiant sunlight that fills his life with happiness, giving him the strength to stand firm and fight his inner demons with her by his side.
The main obstacle to their blossoming romance is Pakapong's deep-rooted desire for revenge. When his biological mother returns with her new family, he decides to leave Rasa behind to carry out his vengeful mission. Heartbroken and devastated by his departure, Rasa contemplates doing things against her own heart out of spite.
Ultimately, however, Pakapong comes to his senses and rushes back to Rasa before he loses the love of his life forever.