Lu Xingzhou is ordered by his master to go down the mountain to deliver an old wooden box. On the way, he saves Shen Xiaoman, but by taking a shortcut, he mistakenly bursts into the Shen family's husband-selection arena, unexpectedly forming a bond with female CEO Shen Zhitang. An old marriage contract inside the wooden box brings to light a promise made more than twenty years ago. Lu Xingzhou, who originally wanted to deliver the item and leave, ends up staying as Haiyue Power faces consecutive management tests and technical disputes. Relying on his extraordinary skills, he joins hands with Shen Zhitang to break the deadlock, moving from confrontation to mutual trust. Facing the old promise and the choice before them, the two decide to follow their hearts toward the future.