You Are Mine, I Am Your Guardian Angel

Sena is a girl who has been isolated from her surroundings since she was young because she can see ghosts. However, her lover Ji-ho was the only one on her side. However, one day, Se Na is dumped by Ji Ho, and unable to find the meaning of her life, Se Na tries to take her own life. At that moment, a mysterious boy with black and white wings appears, calling himself a "guardian angel.''

Original Webtoon:
Kakaopage, Naver Series