Quick transmigration: system of stunning beauty

OMFG, it's worse than I thought. I can deal with the idea of 5 (it's kinda my reasonable limit). What the f, 25?! No wonder they can't take turns but need to have n-somes.  I guess their D's are slave to her V, or why the hell would they share 1 woman among 25 of them. Then again, brain better be off while reading this novel.

Edit: Nevermind, 25 worlds, not 25 men. I freaked out for no reason... She does end up with only 5 right? Right?? 

Each time MC go to a mission world, if I remember correctly, time freeze in her world. And after finishing each mission world she comes back to her world. 

Please spoiler more 

I am addicted to this novel
My Favorite Arcs chapter 396  are is Female Dominant country where gender role reverse. Men were lower and get pregnant. Women had highest statue and rule country and stronger than male.
It's 1vs1 arc
Mc is handsome women and was admired by many men.
ml is rumor known as ugly man in this arc. He was abused by his family and step brothers. Lucky him that he was mc target. Also mc recognize him as one of her lover from previous arc. She give everything for him and doted on him very much. She get really angry when she heard he was abused. She protected him and marry only him lifetime. In this arc, women had multiple hasbands.
Mc was loyal and devoted to ml making all men envy him. She only marry him and protect him.
Male lead wish to meet her next life. His greatest happiness was meeting mc. 

Spoiler????????????? Please 

I feel so weird reading the third arc because once upon a time, I used to be obsessed with brother’s conflict but oh well reverse harem for the win 

Yes. 5 men max ^^ 

Help me to find this novel please! Mc was a miss universe in her original world and has a busy boyfriend who was doing research in the lab. She was died and then transmigrated into a book. Her ex (she broke up with him before she died bcs he was too busy) also transmigrated into the book, and he missed her so much and felt sorry. The plot is like this, she was a fanatic of beauty and doesn't care about study, but now after transmigrating, she has a system who will give her beauty back after she study (winning competition, success in exam, etc). Actually she transmigrated into a body of wrong rich young miss. After she came, the rich family switch them (the real daughter and her). So now she lives with her real family (the poor one). If you know the tittle, pls tell me