Oh! My Dreamy Daddy (2020)

Both are mini dramas in which a couple breaks up due to a misunderstanding, lies, and scheming from relatives. The FL then returns with a stronger, more jaded personality. In both, one of the parents was unaware they had a child or thought the baby died and discover that they now have a five year old child who helps brings the two back together.

It continues the story.
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Both are short length dramas in which a couple has a child together but due to the ML disliking/blaming her falsely, the two separate and the FL raises the child alone. Five years later, the ML re-enters the FL's life and starts raising their child as the couple grow closer.

Both are short length 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. A few years later the ML finds her and their son and brings them back to his home. Both have rich ML/poor FL, a SML pursuing the FL, and scheming relatives of the ML.

Both are mini dramas in which the couple breaks up due to manipulation by the rich ML's relatives, and the FL, who is poor, gives birth to and raises their child alone. Five years later the couple crosses paths again and begin to grow close, raising their child, all while dealing with the ML's relatives.

Same premise, but Oh! My Dream Daddy is a lighter, less melodramatic romance. Especially since it’s 2min per episode!!

Both of these are short series that are adapted from novels with overbearing CEOs along with children. The parents live together temporarily because of their child and slowly fall in love with each other during this time.