I Had Just Turned Eighteen When I Was Reborn, and I Was Full of Energy!

[No system + single female protagonist + rebirth + career-oriented male protagonist] When I was reborn as an eighteen-year-old senior in high school, I first drew a clear line with my wife who had cheated on me in my previous life, and then began to make up for all the regrets in my previous life. Only when I had the feelings of youth and youth at the same time did I finally understand the sentence "I was eighteen that year, and I was full of high spirits!"