Two sisters-in-law become mother-in-law and sister-in-law.

Han Young Min (Lee Jung Jin) and Min Seo Young (Oh Seung Hyun) were engaged to be married; however, Young Min's ex, Jae Hee (Kim Yoo Mi), dumped their son, Jun, on him. Seo Young broke up with Young Min afterwards because Young Min refused to send his son back to his mother. Jo Min Soo (Lee Yoo Ri) befriends Young Min and helps Young Min adjust to his new life with his son. Young Min and Mi Soo soon realize their feelings for each other and plan to marry. However, obstacles stand in their way before they can do so.

Jin Da Rae (Eugene) is the daughter of a female diver in Cheju Island. After her father mysteriously passes away she tries to uncover the truth about his death. One day she coincidentally saves Hyuk (Park Yong Ha) from torrent waters. Hyuk works for an orange farm opposed to his father's wish that Hyuk should take over his resort development business. Da Rae and Hyuk gradually fall in love. However, their love is put to a risky test after Hyuk's half-brother (Lee Dong Wook) also discovers his love for Da Rae. While all 3 of them get entangled in a complicated love triangle, Da Rae finds out that Hyuk is connected to her father's death.