Lawyer Mu Qian and mediator Ou Yang decide to divorce due to lack of trust and mutual understanding. They have been given 30 days of cool-down period before the finalization of the divorce. Since the nature of their work and different cases they work on, the two of them frequently met in the workplace. While handling the divorce cases for some other couples, they come across the problems existing in their own marriage and realise the mistakes they have done. Can the two solve their problems in their marriage and fall in love again after 30 days?

After a big war between Su and Ning, a marriage alliance is established, forcing Princess Ning Qian Xi of the defeated Ning nation to marry the Su general’s son Xiao Qi Feng. On the wedding day, a ghost in a green dress emerges, which leads to the discovery of a female skeleton in a well at the mansion. The wedding gets postponed while the emperor orders Xiao Qi Feng to investigate the case. Su Qing, Qi Feng’s childhood sweetheart, joins the investigation and he really wants to marry. During the investigation, it becomes clear that not one but two parties had plans to assassinate the Queen of Su at the wedding. It also becomes clear that it all relates to an event from 20 years ago and even involves the emperor himself.