Fairy Champagne's manga / #Transmigration(2)

Tbh,i don't quite get the story. I mean,yeah,he became an op character in both world but,i feel like I am satisfied about the plot. For some readers,they could say that is a unique action manhwa or somehow. The plot seems getting too early so i dont really catch up but,yeah, good effort author, editors,and other staff members

No one share the sypnhosis,so here it is Half a year ago, Yun-jae Kim lost his wife and daughter in a car accident, and lives in despair day after day. One evening, his diary completely erases itself, leaving behind an ominous message: "you can see them again". 'The 'Holy Grail' is given to those who overcome the 'game' of 'The World of the Backside', and it is said that if you use it, you can reunite with your lost family ... In the cruel world where only the strongest survives, Yun-jae becomes the only one who knows the future. Will he be able to fulfill his wishes? I hope you enjoy reading!