Both have great actors

Both have good chemistry

And its basically original story, which jdrama adapted

"All the way to the sun" And " Cupid kitchen" Both shows have age between female lead and male lead.

"All the way to the sun" And " The rational life " Both dramas have age gap between female lead and male lead.

"All the way to the sun" And " Crash course in romance " Both dramas have age gap between Female lead and Male lead.

"All the way to the sun" And "My mister" Both shows have age gap between male lead and female lead.

"All the way to the sun " And "Mr Sunshine" Both shows having age gap between female lead and male lead.

"All the way to the sun" And "Dating in the kitchen " Both shows having similar age gap between female lead and male lead.

Both male leads are neurosurgeons. Both couples have reunion after years . There is same theme for first love and slow burn romance.