My Daughter Geum Sa Wol (2015)

They have a lot of things in common, but especially the second female lead
Just that in HL more people knew about the secrets, as in MDGSW.

Switched children concept, the rich kids daughter grows in poor girls home and vice versa. Fashion 70s is about textile industry and clothing while My Daughter Geum SaWol is about architecture and construction industry

Switched children concept, the rich kids daughter grows in poor girls home and vice versa. Feast of the Gods is about cooking contests and restaurant management while My Daughter Geum SaWol is about architecture and construction industry

Written my the same writer.
Also the same type of theme with the main lead having her identity taken by someone close to her.

Twinkle Twinkle is about a reversal in lives of two families when they find out that their children were swapped after birth. Similarity with My daughter Geum Sa Wol lies in the jealous behavior of one of the women and some family issues.