emeraldarrows

Both are a gender-flipped version of each other - the FL vs. ML believes their baby died, causing the couple to break up. The other parent (father vs. mother) raises the child alone and five years later they cross paths again, with the other parent suspecting and trying to confirm if the child is their's.

Both are dramas in which the ML treats the FL coldly, blaming her for something she didn't do, and the two separate, with the FL giving birth to and raising their child alone. Both have rich ML/poor FL, a SML pursuing the FL, and scheming relatives of the ML.

Both couples break up due to the ML's family's manipulations and misunderstandings, with the ML believing the FL had a miscarriage. Five years later, the couple meets again, with the ML discovering the baby lived and he has a child.

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Both are historical dramas in which the ML is ill with a short time left to live that he then shortens saving the FL. They are weak physically but strong mentally and in both dramas are involved in the power struggle for the throne. Both MLs are doctors or work as doctors for a time. Both FLs misunderstand and are separated from the ML for a long time.

Both have a similar plot of the FL marrying the prince who then becomes the emperor. Both FLs become trapped between the two royal brothers as well as the emperor's evil concubines. Both FLs lose at least one child due to the emperor, and are believed to have lost their fertility as well (in the movie BCTSAL the FL learns she is pregnant again). A lot of both dramas are set within a palace and the FL undergoes a lot of hardship and emotional growth.

One is the drama, the other the finale movie which gives it a proper ending.
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Both are fantasy/historical dramas with a older master ML and a younger disciple FL. Both MLs are cursed/harmed in some way (a cold curse vs. a wolf curse), and both FLs start out very innocent and then experience a lot of grief and loss.

Both are historical/fantasy dramas in which the ML is poisoned/cursed resulting in an animal-like personality to emerge.

Both dramas involve characters under a "wolf" curse that takes over their personality. Both also have a star-crossed romance between the leads.

Both are mini dramas that begin with the ML "purchasing" the FL. Both MLs are rough, FLs seemingly innocent.