A handsome man has just emerged in Ji Kerr's room! As it turns out, he's actually a long-time guardian of the Ji family who comes all the way from the Ming dynasty. And he comes with a warning: her family is in dire trouble. But he'll show her how to save her family, as long as she shows him what it means to fall in love?! Time travel, a hot guardian deity, and romance await in this adventure-filled webtoon!

Xi Wu, a rebellious young mermaid, goes ashore to terminate her betrothal to the "fiancé" that runs a fashion store, but she ends up releasing the magical creatures sealed inside the mysterious dresses.