Exchange Marriage for 70 Years, Marry a Scientific Research Boss, and Have Three Children

(Military marriage+era+marriage first, love later+sister twins+swap marriage+one child, three treasures) Sisters are born in pairs! In the previous life, my sister Su Banxia was forced by her stepmother to marry an educated youth from the countryside who had a baby. Not only did she live in a cowshed, she didn't even get a bride price. She thought she would live a miserable life. However, she didn't know that the educated youth who went to the countryside were very successful. They were admitted to university, became a teacher, and later joined the Education Bureau and became the director, becoming a couple that everyone envied. Her younger sister, Su Yingying, married a scientific research boss carefully selected by her mother. She thought she could live a prosperous and happy life, but she didn't know that the boss was obsessed with scientific research and stayed at the military research institute all day long. Not only was he damaged his roots due to experiments and was inhumane, but he was also violent every day. Later, her younger sister was really lonely and cheated on someone else. After she was caught, the matter spread widely, and she was overwhelmed and committed suicide. After resurrecting her life, her sister no longer wanted to marry a scientific research boss, so she framed her sister so that she would marry a boss while she married an educated youth. I thought that in this life, two people who changed their relationship could change their own destiny, but I didn't know that things were not as simple as imagined. Doesn't it mean that the boss is obsessed with scientific research? Why go home every day? I can't even drive them away. Didn't it mean that educated youth were admitted to university? Why can't I pass the exam for several years in a row?