Only I can see this grim reaper?!

Seo-U has just about had it with life. But when she's about to jump off a bridge, she's interrupted by a grim reaper nobody else can see. Not only that, the reaper wants her to stay alive for 3 more months! A woman who wants to die and a strange reaper — will Seo-U finally find a reason to live?

(Source: Manta, edited)