Looking for a novel with this premise

i don't actually know the name, so I just have the premise of this novel. please help me.

She discovers that her husband did not actually die as everyone believes. Instead, he faked his death and secretly assumed the identity of his younger twin brother. Rather than exposing him directly, she goes to a high-ranking military authority and reports her husband as deceased, asking for his discharge and removal of rank.

In a previous life, the twin brother died in an accident. In this life, the husband stages his own death and abandons his military position to live as his twin, all to prevent another woman from becoming a widow. The protagonist recognizes him immediately and confronts him, demanding to know why he is pretending to be his brother. He denies everything and coldly rejects her, claiming she is delusional from grief.

He publicly supports the other woman while pushing his wife aside, even humiliating her. Their young daughter, confused and heartbroken, asks why her father no longer loves her. The child is punished harshly, locked away without food for days “to teach her a lesson.” Meanwhile, the husband’s mother verbally abuses the protagonist, blaming her for everything.

Betrayed, abandoned, and mistreated, the protagonist is forced to endure humiliation and emotional cruelty while the man she loves chooses another woman and denies his true identity.