The thoracic surgeon, Lee Jinhyuk, has dedicated decades of his life solely to his patients. Yet, he couldn’t be there for his own mother’s final moments, spending sleepless nights filled with regret. But when he wakes up, it’s suddenly February 1998—back to his days as an intern?! In his second life, he wants to devote his time entirely to his family… But no matter what he does, living quietly just isn’t an option!