Chaloey Bap

After Police Sub-Lieutenant Thot Phisanwat-thana returns from duty, he reluctantly attends the 40th-anniversary celebration of Phisanwat-thana Company, the largest construction firm in the country. His girlfriend, Phaka, pleads to accompany him, so Thot brings her along on his trusty motorcycle. Phaka is thrilled to discover that Thot is the youngest heir of Mr. Thawee and Khun Ying Mar-yat, the wealthy owners of the empire.
At the event, Atsawin, the prominent eldest son and ideal successor to the family business, appears alongside Metinee, a beautiful and high-born woman who is perfect in every regard. Phaka immediately sets her sights on securing Thot, dreaming of becoming a high-society daughter-in-law. However, Thot views Metinee as just another superficial, extravagant socialite—a type of woman he finds utterly exhausting.
Anan, the middle son who chose an independent path as a photographer away from the family business, also attends at his mother's request. As usual, Mr. Thawee is irritable, criticizing both Thot and Anan and belittling their careers until Anan can no longer stand it. Despite Atsawin’s attempts to mediate, Thawee ignores his eldest son's goodwill.
Meanwhile, Chaiyot, owner of Chai Amon Boon and the primary rival of Phisanwat-thana, orders his sons, Phanom and Khosit, to defeat the competition by any means necessary. While Phanom is hesitant, Khosit agrees immediately, harboring a personal grudge against Atsawin dating back to their school days.
Back at home, Phaka gushes about high society to her older sister, Fonthip. Despite Fonthip’s warnings, Phaka refuses to listen and instead mocks Fonthip’s relationship with Marut, a drunkard. Marut, who has a history of conflict with Thot after being arrested by him, later tries to assault Fonthip, but Thot arrives just in time to rescue her. This causes Marut to lash out at Thot for interfering and deepens his vendetta.
As the rivalry intensifies, Atsawin proudly takes Metinee to a class reunion, unaware that Khosit is determined to steal Metinee away just to humiliate him.