If there's one thing Hwan Seok can't stand, it's witnessing injustice. But this time, getting involved with a pair of men targeting his next-door neighbor, Yerin, costs him his life. Three days after his murder, Hwan Seok wakes up... alive! Armed with his newfound ability to be brought back to life after three days, Seok is determined to save Yerin but soon realizes he's gotten himself entangled in a plot bigger and more sinister than he originally imagined...