Manga Return for Revenge

When she was hit by labor pain, what greeted her wasn’t words of comfort but vile accusations of infidelity. Killed in defense of her unborn baby, she vowed to take revenge on them all… and God granted her a second chance. However, it seems that she’s not the only one brought back. Who’s that silver-haired guy in mask? Why does he seem to know her every move, yet still willingly provide unconditional help regardless?