Cha Young Min, a genius but cold-hearted surgeon, finds his life upended after a sudden accident leaves his spirit trapped in the body of Seung Tak — a wealthy, carefree resident with no real passion for medicine.

The two couldn't be more different: Young Min is all about skill and ambition, while Seung Tak relies on luck and privilege to coast through life. Now forced to share a body, they must navigate hospital chaos, uncover hidden truths, and learn from each other in unexpected ways.

As they clash and collaborate, will they both come out better doctors — and better people?