Poong, the Joseon Psychiatrist

Expelled from Hanyang after a failed treatment, prodigy acupuncturist Yoo Se-yeop encounters eccentric Dr. Gae Ji-han and an enigmatic widow.

Se-yeop swiftly recognizes the injured Eun-woo at Gyesu Clinic, prompting his resolve to understand her choices.

Sorakhyun is shaken by the appearance of the Gumiho, believed to be a girl. Suspicious, Sepoong and Eun-woo investigate.

Sorakhyun's Left Minister claims to have killed the king. Sepoong grapples with haunting memories as a woman with an identity disorder seeks help.

Sepoong and Eun-woo grow closer as they treat patients together, but Eun-woo feels uneasy observing their bond. What is the truth behind the king's death? With evidence regarding that day's truth, Eun-woo heads to Gyesu Clinic.

Sepoong delves into "Haedongboncho," tied to his father's death, nearing the truth. Meanwhile, Gyesu Clinic faces a crisis with Gae Ji-han's debts.

A mysterious plague grips Solak Village, with Sepoong and Eun-woo dedicated to treating the sick, while Gae Ji-han harbors suspicions about its true nature, haunted by painful memories.

Having saved Sepoong's life, Eun-woo advises him to leave Gyesu Clinic, while Sepoong endeavors to uncover the secrets of Dansa Grass. Meanwhile, kidnappers appear in Solak Village, targeting Eun-woo!

Sepoong nurses Eun-woo while facing a figure who holds the truth of that day, as factions targeting Sepoong's life emerge.

As the sole witness to the truth dies before him, Sepoong faces despair but persists, journeying to Hanyang with Eun-woo to uncover the king's death's truth, while Im Soon-man plots to dismantle the Gyesu Clinic in a grand conspiracy!

As evidence mounts, Sepoong fights to clear his name while his feelings for Eun-woo deepen, but as the true murderer emerges, he faces his ultimate reckoning with the truth.