The unhappy adult main lead (s) travel back to youth period, where she and they were happy, careless, energetic and having fun. It is an easy watch romantic comedy

Both female leads were adult in the thirtieth but mentally as a teenager.
Somewhat comedy, fun and easy watch.
Quite romantic.
Cute couples

The character travel back and forth from young to old and old to young.
Somewhat comedy
Fun watch. Not too serious. Good acting.

Both female leads has terminal illness
The male lead knowing that and stick with her till the end.
Very romantic, love story

Both female leads has terminal illness
Very very romantic movie
Heart warming,
Male lead remain on her side till the end

Both female leads have terminal illness
Both movies has talented musical actor or actress
Heart-warming sweet movies
Very romantic

Both female leads has terminal illness
Very romantic
Roller coaster ride relationship
Very beautiful main couple

Both female leads has terminal illness
Beautiful couple, strong bonding
Heart-warming, royal, challenging life
Die-heart romantic

Both female leads has terminal illness.
Both are Chinese movies
Both movies has some silliness, heart-warming moment.

Very beautiful couple
Both female leads has tragedy
Both male leads complete their love
Very beautiful story.

Both female lead has terminal illness.
Die heart love story.
Very romantic.
Great chemistry, beautiful movie

Both are Japanese movies. Both are cars. Sport cars. One involve racing the other one involve car show, expensive cars etc.