Little Black Book vs Blue Blood

Little Black Book vs Blue Blood manga summary: All of a sudden, I traveled through time and space to be a Little Black Book, bearing the mission to grant Prince Kang a baby, and only after that, could I travel back. It's a journey to get him back on the road! But it's technically difficult to help a delicate but handsome man learn how to flirt with the beauties. Follow my lead, let's set out on a magical time travel!