In order to save her family, Su Qingyan was forced to marry Mo Yuanchen, who was rumored to be cold and taciturn. She thought it was a contract marriage where they respected each other like "ice", but she discovered that her husband was hiding a shocking secret. Mo Yuanchen is actually an ancient dragon god hidden in the world. He is responsible for protecting the three realms and always appears out of thin air when she is in danger. After getting along with each other after marriage, his clumsy gentleness and occasional dragon-shaped habits made Su Qingyan's heart move, and the bizarre disappearances surrounding her were actually related to Mo Yuanchen's old enemy. The two work together to investigate the case in their sweet daily life, and unlock the fairy romance of marrying first and falling in love later.