Intro. Kang Tae-oh (38) is the epitome of success—a titan in the electronics industry who possesses everything: wealth, luxury estates, and power. However, he is haunted by the void of having no heir to inherit his empire. Driven by this realization, he tasks his best friend, Doyoung (37), with finding him a suitable partner. To his shock, Doyoung chooses his own cousin, Arin (21), a brilliant recent Metallurgy graduate from Seoul National University.
Tae-oh is initially skeptical, viewing the 17-year age gap as an impassable canyon and Arin as a mere child. Yet, Arin’s fresh perspective and her "steely" resilience—a byproduct of her technical background—begin to captivate him. She doesn't see him as a billionaire, but as a man. For the first time in his life, Tae-oh finds his cold, calculated business world slipping to second place. In the warmth of an unexpected spark, he discovers that love is the only investment he can’t afford to lose.