The Untold Twins' Secret captures the life of a set of twins, Alexander and Genevieve. At the age of three, Alexander was kidnapped by his father. The secret of the twins' identities and awareness of each other's existence was hidden from them. However, the unforeseen circumstances that happened to one of the twins resulted in the two families reuniting again after 21 years, and the secret came out. When the twins finally meet each other, the bond between them is very tight even though they grew up apart in different worlds, and went through different life experiences.