Linking Love (2017)

Mashio Miyu is a university student. She hopes to become an idol, but her dream doesn't seem to be going anywhere. One day, her mother, who does not like her father anymore, leaves home. Miyu doesn't know what to do. A mysterious man suddenly appears in front of her. The man tells her that he will grant her 3 wishes.
He sends her back into time to 1991 and to the university where he parents attended. There, she meets her parents who are now students. Her mother likes her father, but her father doesn't like her mother at all. To get her parents together, Miyu forms an idol group with her mother.

Mashio Miyu is a university student. She hopes to become an idol, but her dream doesn't seem to be going anywhere. One day, her mother, who does not like her father anymore, leaves home. Miyu doesn't know what to do. A mysterious man suddenly appears in front of her. The man tells her that he will grant her 3 wishes.
He sends her back into time to 1991 and to the university where he parents attended. There, she meets her parents who are now students. Her mother likes her father, but her father doesn't like her mother at all. To get her parents together, Miyu forms an idol group with her mother.

Plots seems similar with the daughter traveling to the past when the time her parents were students. In Linking Love her parents have been together but breaking up but in IDWTBFWY, her mother is a single woman.

Pontifex Rembrary, a character known for his divine powers, gets transported to a new world while fighting a devil. He possesses the body of Woo Yeon Woo, a member of an unpopular idol group, and helps turn the group's fortunes around after a disastrous live performance. With his charisma and divine powers, he becomes popular among fans but faces challenges from his past, contending with strange religious groups and the devil.