Claimed by My Billionaire Sister: The Family's Only Treasure

What if your entire life was a lie? Su Yang thought he was just another orphan scraping by—until a stunning heiress walks into his world the day after his 22nd birthday, claiming to be his long-lost sister. Suddenly thrust into a world of unimaginable wealth and power, he discovers he's the sole heir to a business empire. But being the family's precious treasure comes with its own dangers: jealous rivals, hidden agendas, and a sister whose doting affection might be more complicated than it seems.