According to legend, if a couple starts on either side of the Water Maze and meet in the center, they're meant to be together forever...

When Youngmin and Kwangmin were born, their parents negotiated Kwangmin would be betrothed to a girl of another family. Seventeen years later, Yoomi finds herself betrothed to Kwangmin.  While he falls in love at first sight, but his twin doesn't get along with her. One day, Youngmin and Yoomi accidentally run into each other at the center of the Water Maze, but because of their rivalry, they deny their fate set in front of them. After working at her future mother and father-in-laws' k-pop entertainment company as a songwriter, she falls in love with both of them- Kwangmin, supportive, reliable, willing to do anything for her; and Youngmin, arrogant, determined, putting everyone at a distance but her. When an ex-girlfriend and a secret come out, will Yoomi choose her lover or her soulmate before fate chooses for her?