When struggling bookstore clerk Noah unexpectedly saves Rose, the matriarch of a powerful billionaire family, the grateful grandmother decides to play matchmaker for her lonely grandson. Determined to test for true love, billionaire heir Victor disguises himself as a broke delivery driver and enters a whirlwind flash marriage with Noah. Caught in a tangled web of secret identities, mutual tests, and escalating external crises, the two unexpectedly fall deeply in love—ultimately learning that only radical honesty can break down their walls and protect each other.