Spring Waltz is a modern romance about contract marriage, family conspiracies, and true love. To save her mother, humble quantitative analyst Isabelle Chan agrees to a $5 million marriage contract with billionaire Sebastian. When she unexpectedly becomes pregnant, she is drawn into a web of family intrigue. As Sebastian's icy heart begins to thaw, their contractual union blossoms into genuine love, transforming Isabelle from a mere bargaining chip into a cherished wife and mother.