Commercial female boss Song Zhixia bitterly searches for a childhood old friend separated for fifteen years. Mysterious man Zhou Yanbei comes with zero salary to be a bodyguard, stepping forward time and again to protect her. Company vice president Meng Junhui, coveting property, counterfeits a token to falsely claim to be the old friend, setting traps everywhere to frame the two. Song Zhixia calmly observes and sees through the scam, Zhou Yanbei collects evidence, exposing all of Meng Junhui's conspiracy. Having gone through storms, the two confirm each other's identities with half a longevity lock. Zhou Yanbei wins respect with his strength, the two untangle fifteen years of longing, and hand in hand rush toward the future life.