emeraldarrows

In both, the main couple breaks up and the ML has anger toward the FL due to lies and misunderstandings. Five years later, the two cross paths again, and the ML discovers he has a child he didn't know existed. Both kids are ill and need treatment.

Both are about a couple breaking up, with the ML holding anger toward the FL, believing she betrayed him. A few years later they accidentally meet again, and the ML discovers she has a young child and a man by her side who he initially assumes is the child's father. However, he soon learns he's the child's father.

Both are mini dramas in which the couple breaks up and reunites accidentally a few years later, leading the ML to discover he has a child/children he didn't know existed.

Both are mini dramas in which a couple breaks up and meets again a few years later at which point the ML discovers he has a young child he didn't know existed.

In both, a couple breaks up and the FL secretly gives birth to their son alone. Five years later the couple crosses paths again and the child's starts bringing them closer together again.

Both are mini dramas in which a couple separates due to lies/misunderstandings and reunite accidentally a few years later, with one learning they have a young son they didn't know existed.

Both are about a couple becoming close through the influence of their adorable young son.
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Both are about the main female character having a supernatural ability to "hear" people's secrets (lies vs. inner thoughts). Both have a colorful cast of characters and a mix of drama and humor.

In both, the lead (FL vs. ML) can "hear" a person's secrets (thoughts vs. lies) and as a result they have a somewhat jaded view of people.

Both are historical dramas in which the couple marries at the beginning - one of them is happy for the marriage and the other very unhappy. Despite being seemingly very mismatched the two end up complimenting each other's strengths and weaknesses and fall in love.

Both FLs have an ability to change faces (themselves vs. other's) and have a childhood friend who (eventually) becomes part of a love triangle or rectangle. Both FLs heal and save their future love interest who is introduced as a tortured, dying, and mute person.

Both are a lifelong friendship that turns to romance with the FL older than the ML and always getting him into trouble as children. Both have funny flashbacks to their early childhood, and both MLs are more quiet while the FLs are bolder. The leads' parents are also very close.