In A Promise Best Left Unkept - Bonus S1, Harry's determination to honor his promise to his girlfriend a year ago pushes him to achieve a significant milestone: landing a critical deal for his company. This success propels him toward a well-deserved promotion. However, his hard work brings an unexpected complication: his past catches up with him when the representative of the subcontracting company turns out to be none other than his former high school bully.