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In the operating room, Dr. Jinhyeok Lee is flawless—unyielding, brilliant, and untouchable. But outside, he’s a ghost to his family and loved ones. He misses everything, even his mother’s final moments. By the time he understands what he’s lost, it’s too late… until it isn’t. He wakes up 27 years in the past. Now armed with a lifetime of memories, Jinhyeok vows to live differently. But peace won’t come easy. Old rivals, new battles, and countless lives await. Scrubs on. Lights up. Scalpel ready. And this time, Primum non nocere.

Ange, the daughter of Duke Glaster, believes her life is all planned out as she is set to marry Philip Cardiner, the rightful heir to the throne. However, her plans are disrupted when Philip's brother, William Cardiner, schemes against him and removes him from the line of succession. In order to secure his power, William forces Ange to marry Aiden Fitzroy, an illegitimate child born between the emperor and a commoner. Will Ange learn to love the humble stranger she was forced to marry?