Su Lin (Xiao Lu) goes back to 1949 and meets secret agent Sun Zhi Yang (Williams Leon Jay). One after another, the two complete multiple life threatening missions. Through these missions, Su Lin finds herself falling in love with Sun Zhi Yang, someone who is destined to die in history. Su Lin now has a more dangerous mission, which is to prevent Sun Zhi Yang from dying. Will she be able to change history with the power of her love?