In His One and Only Love movie, Lyla grows up feeling different from others and struggles with a sense of inferiority. Forced by her family to work and earn money, she faces abuse at every turn. On her 22nd birthday, Lyla wishes for true love. While working a part-time job, she saves Leo, a handsome and gentle president, and unexpectedly becomes pregnant. Leo takes her in and cares for her tenderly, and over time, their love blossoms. However, as they uncover the mystery of Lyla's past, they find themselves entangled in a web of conspiracy and evil. How will Lyla defend their love? What kind of ending awaits her and Leo under the care of the Goddess of Fate?