The Regent of Great Jing transmigrates unexpectedly and becomes Xie Wujiu, a cold-faced business tycoon in the modern world. In his previous life, bound by a marriage in name only, he spent half his life in solitude and never fell in love. Then he encounters the gentle young woman Song Zhiwei on Douyin.
Love at first sight leads him to set aside his sharp edges and pursue her with all his heart, cherishing and protecting her in every way. Their clashing ideas from different eras spark plenty of amusing everyday moments. But then a woman carrying the obsessions of his past life suddenly appears, and a thousand-year-old bond and the shackles of the past come rushing back.
On one side is the rare, tender love he has found in this life; on the other are old ties bound by an inescapable fate. Carrying a hidden past, he vows to protect the moonlight in his heart and spend the rest of his life keeping one person safe.