Both are stories of a FL who was trapped into marriage by an evil man and her eventual revenge. Plus Dai Gao Zheng is in both : )

Both ares stories of a love-hate relationship wherein the man lied to her about his identity and is framed into being guilty of murdering her family, and though she hates him she can't get rid of her feelings for him.

Both male leads purposely deceive the female lead about their identity from the very beginning in order to either protect her or keep her close to him. If you want a short length series with angst and a love-hate relationship, these are good picks.

Both are short length series that have hilarious medical reasons for the main characters to kiss a lot : )
In First Kisses the FL needs the kiss of the ML to help with her amnesia and in Love Me in 3 Days the ML needs the kiss of the FL to prevent himself from transforming into someone else. Super ridiculous but they're both short, sweet, and cute, so if you need a quick and quirky little filler series, these two should do.

If you like love stories between a mortal woman with a terminal illness and an immortal being, both have this trope. Doom is more slice of life though.

Both shows are absolutely gripping and showcase the growth of the unlikely friendship between a cold man and a female detective who knows how to hold her own. Both are trying to solve a case that leads back to corrupt politicians. If you enjoyed one, you'll definitely enjoy the other.

Both stories have a marriage of convenience, a secret child, and romance between a good and sweet woman and a possessive man who constantly misunderstands and thinks she's only after money or is cheating on him, which drives him crazy because he's in love with her.

Both stories contain a romance that encounters lots of misunderstandings, jealousy, and revenge, but ultimately end in forgiveness.

They have a similar storyline where the villain is the lead's sister whose actions force the main leads to marry. Both male leads think the heroine is greedy.