Review Detail of CosmicMonarch in Infinite Mana in the Apocalypse

* I love the story.... But * What I don't understand is that MC let his son kill Oppenheimer, who saved the entire realities and technically MC owes his existence itself to Oppenheimer...Without him everything would have ended. But they killed him. * But, he let Athena, who decimated decimated entire planet Live? and also Barbotas, who tried to kill him and also killed living being in an entire planet just for her Undead Army? * He even adds them into his Harem? * Why does Chinese authors prefer Harem over Story?