The Love You Give Me

The story of the series "The Love You Give Me" is that Despite his lingering anger, Xin Qi soon learns that Min Hui has a son with the same heart condition he suffers from, leading him to realize he is the father. Through heartfelt conversations, explanations, and a quirky living arrangement, can they heal old wounds and rekindle their love as a family?

Both MLs have heart conditions and a past connection with the FL. Both dramas involve a character (ML vs. SML) discovering he has a young son he didn't know existed. Both dramas have a similar feel.

In both a couple breaks up due to a misunderstanding and lies, and a few years later the two cross paths again. Despite the ML initially having anger against the FL, the two become closer when one of the parents who was unaware they had a child or thought the baby died discover that they now have a five year old child.

Both are about a couple becoming close through the influence of their adorable five year old son.
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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 begin living together solely for the child's sake who starts bringing them closer together.

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The drama tells the story of how an ordinary girl Xia Guo chooses when faced with two different choices, and what happens. The drama is presented in parallel time and space. The different choices of the heroine will lead to different endings.There are the challenges and dilemmas of the big city; but on the other hand, there is the stability and triviality of the small town. In life it is always necessary to make concessions, without fear of loss, and moving forward to embrace that sense of the "extraordinary." If life could have other versions, and the "if" could be experienced, what would it look like? The drama realizes this "if" so that the heroine experiences two lives in parallel. How she will handle those choices is the big question.

"I live elsewhere" (from original title in chinese).

Source: DramaWiki

FL ran away, give birth to ML's child, then comes back years later. In both dramas, the kid is sick, and the SML is a doctor, and is close to the FL (in TLYGM he has a crush on FL and is her best friend, in RF he is her ex).

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. The two begin living together.

Premise is similar… girl is forced to leave her partner while being pregnant with their child. She comes back and hides that the child is his and he hates her.