The manhwa 'Will Die for You' has a storyline where the characters go through intense emotional turmoil for each other. The theme is about the lengths one would go to for love, with elements of selflessness and determination. It's full of heartwarming and heartbreaking moments.
Often, in such manhwas, it could be a combination of external pressures and internal conflicts. Maybe they feel there's no way out of a difficult situation or believe their death would have some greater meaning or purpose within the narrative.
The story in 'I was told to die' manhwa could vary greatly. Maybe it's a fantasy adventure with a dark twist, or a drama centered around a character's fight against a fatal prophecy. Hard to say exactly without reading it though!