Please recommend a novel about a story that happened a few years ago. The female protagonist's family was rich, while the male protagonist's family was poor. The male protagonist had to help his father pay off his debts, and the female protagonist secretly fell in love with the male protagonist.

It was a few years ago. The female protagonist's family was very rich, but the male protagonist had no money. Moreover, he had to help his father pay off his debts. The female protagonist had a crush on the male protagonist, but because of the mistake of Chayang, they arranged to meet in a park. In the end, the male protagonist went to another park, while the female protagonist went to a different park, waiting for the male protagonist. Later, they missed each other. The female protagonist went to America, while the male protagonist stayed in Cheng City, where they were studying, to develop his career. Later, the male protagonist entered high society, and the female protagonist came back. On her birthday, she met the male protagonist again. Later, they got together, but on the day of their wedding, the male protagonist saw the female protagonist with another man. That man was called Abu, the bodyguard who had always been by the female protagonist's side. Later, he found out that the one who slept with Abu was not the female protagonist, but the female protagonist's father found someone who looked exactly like the female protagonist. They originally looked different, but the female protagonist's father pulled them into the female protagonist's appearance. Later, the male protagonist misunderstood the female protagonist. It's a sad story, but I forgot what it was called.