Rebirth in the Apocalypse: the Rules of a Loyal Dog and Doting on His Wife

"If there is an afterlife, I... Will definitely live up to you!" Bian Qingyun's father died young when he was five years old, and his mother remarried. She was engaged to be married to Chen Ling, and she grew up in the Chen family. As a girl, she had a secret love for the mature brother Chen Ling, and waited for him for many years. Before the wedding, a zombie virus broke out in the world, and the two were suddenly separated in the apocalypse. When they met again, they were in opposite camps... Chen Ling resolutely pursued his goals throughout his life, but always succumbed to the little girl he had always regarded as his sister. In the apocalypse, he became the strongest fully evolved person. However, the two drifted apart due to some misunderstandings. In the end, because of his wrong belief, the life of the person he loved the most was ruined. Bian Qingyun died at the hands of her love rival in her previous life. When she opened her eyes, she found that she was reborn and returned to the morning when the crisis broke out 13 years ago. This time, she would never make the same mistake again. She vowed that she would change everyone's destiny! Reversal of the ultimate tragedy! Just—— "Chen Ling... What should I do with you?" "It's better to stay together and live a hundred years without worries." Then stay with each other, never leave, hold hands on the long road, and don't let anyone get lost. The male protagonist is a strong and loyal dog x the female protagonist who is mentally ill and has different appearances