As their calling as surgeons and their personal wants clash, thoracic surgeons of the show face grave dilemma.
A donor heart goes missing mid-surgery. Tae Soo's mother falls ill, forcing him on a desperate search for someone to save her.
Seok Han saves Tae Soo’s mom. As a fellow, Tae Soo defies orders to save a patient. Soo Yeon faces crisis on her return flight.
With no tools, Tae Soo and Soo Yeon use super glue to save a life. His mom flatlines, but Soo Yeon gets her on ECMO in time.
Soo Yeon visits Yoo Bin’s memorial. Tae Soo is fired for the glue op, but a corruption scandal threatens the hospital’s head.
Blackmailed, Seok Han faces his past. Tae Soo’s mom wakes but needs a transplant. Soo Yeon struggles to breathe and seeks surgery.
Hyun Mok rejects his brother’s plea, then gets into an accident with Soo Yeon. Choi fights to save them both in the OR.
Tae Soo’s mom gives up her heart for Soo Yeon. He’s devastated. Soo Yeon wakes up—only to fear the uncle at her bedside.
Tae Soo buries his mother. A year later, Soo Yeon becomes assistant professor. A new fetal surgery proposal causes tension.
Soo Yeon rushes blood to Tae Soo. She opposes a live fetal surgery, while a secret delivery hints at deeper truths.
Tae Soo asks to return. Choi agrees. A major surgery is set, but it’s delayed by TV show drama. Soo Yeon suspects foul play.
Tae Soo aces his comeback. Choi is asked to operate on a presidential candidate. Soo Yeon digs deeper into her father’s death.
Soo Yeon confronts her uncle over embezzlement. A debate begins over a risky baby surgery. Choi agrees for personal gain.
A death in surgery makes Director Yoon smile. Rivals plot against Choi, sensing his fall—and eyeing the chief role.
Choi’s team leaves mid-op to help Tae Soo. Director Yoon wants him fired, but Choi reconsiders. Soo Yeon finds a buried truth.
A patient dies from Yoon’s bias. He plans a Russia hospital and warns Choi: no slip-ups with the high-profile heart surgery.
Tae Soo fakes out Yoon to save a young girl. Soo Yeon performs the surgery in secret, as the hospital basks in fake glory.
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