Like at most  halfway through the drama and not in the final episode.

  • Eternal Love
  • Empress Ki - There's a big love triangle and whether or not this meets your criteria sort of depends on which guy you feel is the ML.
  • The King's Woman - The SML is the father but the ML agrees to raise the child as his own. 
  • Dongyi
  • Begin Again
  • Hogu's Love - kid is not the ML's 
  • Rosy lovers - the FL left their kid to be raised by the ML
  • Start of the drama:
    • Heard it through the grapevine
    • Wonderful life

Heard it through the Grapevine!!! To me it’s one of the most underrated dramas ever that should’ve reached the success Sky Castle & dramas like it did bc it basically did that genre just a few years too early before it became popular. Bom, the FL, is heavily pregnant from the first second of the drama & gives birth really quickly into it. It’s not purely like a young Mom & Dad romance (they’re underage & from very different social and financial worlds) so there’s lots of intimate romance but just as much well done social commentary, politics, morality/immorality & ambition.