A young social worker is inconsolable after a woman loses her own life while saving his. Imagine his shock when she suddenly reappears -- alive.

Se Yeon lets Jung Hoon in on the secret behind her immortality.

Unable to stop thinking about Se Yeon, Jung Hoon orchestrates a "coincidental" meeting.

Know what this is about?

Now that Se Yeon is showing signs of aging, will she be able to grow old at a natural pace, alongside Jung Hoon?