There Must Be Happy Endings webtoon
This is the story of a late budding romance, faced with danger and a life at stake. Yeon-Woo and Seon-Jae have a marriage agreement that lasts 100 days. On the day that marriage ended, Seon-Jae suddenly passed away. At that time, their ‘real’ marriage has only just begun. Yeon-Woo, who is swept in sorrow, is given a chance to return 100 days back in time and she decided to prevent the death of her husband.
반드시 해피엔딩; Surely a Happy Ending