AsiaNur

Both dramas tell the story of high schoolers who are upstairs-downstairs neighbours, in fact even the same building is used.
In Go Ahead the story continues into their adulthood in modern times, When We Were Young takes place in the 1990s.

In both dramas FL takes the place of somebody else. FL in The Double wants to take revenge, while FL in Coroner's Diary wants to clear her father's name. Coroner's Diary is focused more on romance, mystery and medicine.

Both rebirth dramas. FL in Blossom returns to her childhood waking up from a dream. FL in Echoes of the Self returns to the past but into a different body.
ML of Echoes of the Self is also in Blossom as a supporting character.

Both dramas focus on healing in a small town. In Meet Yourself, FL travels after losing her best friend, in Bloom Life FL returns to her hometown after losing her father.

Both dramas have the FL as the head of the family, and they rescue the ML with a hidden identity. Pursuit of Jade is focused more on war, while Glory is focused more on business.

Both rebirth dramas, with FL remembering the past where they died because of their husbands. FL in Blossom tries to get rich and leave her cheating husband, FL in The Tower of Whispers tries to first take revenge on, then rehabilitate her tyrant husband, the emperor.

Both rebirth dramas, in The Tower of Whispers FL remembers the past, in Ban Xing Fu Sheng many people remember the past, but the main leads don't.

Both historical mystery romance dramas. Both FLs have medical background and use assumed identities. Both MLs have an official position to investigate cases and fall first for the FL.

Both dramas about parenting non-biological children and start off with a fake marriage. Please Be My Family is more wholesome, Disguised Family is a short drama with action focus.

Both FLs are martial art masters and MLs are their pupils. Qingchuan's Veil of Vengeance focus more on sword fight and politics, Secrets of the Shadow Sect focus more on romance and sects.

Both FLs pretend to be a man, in a non-cute more believable way.
In Dominion and Devotion the FL is the emperor, it's more dramatic.
In The Cross-Dressed Union the FL is a scholar, and her WIFE is a cross-dressed man, it is more light-hearted.

Both by the same director, both stories told over multiple timelines. Someday or One Day has time travel, Sniper Butterfly has stories of past and present told together.