Your Highness, spring seems to be coming.

EXO-Planet's crown prince Baekhyun suffers from a mental illness due to loneliness, and the mental illness begins to harm his body. The emperor, who cannot stand to see Baekhyun, brings in a new court lady to help him get rid of Baekhyun's loneliness, but Baekhyun is not willing to give his heart to him.