Both are historical and involve the leads, seemingly strangers, marrying at the beginning. However, it is revealed that the leads met years ago briefly and still remember it, but one either failed to see the other's face or has changed their face, meaning the ML only recognizes the FL after their marriage by a distinctive scar she acquired that day. Both MLs have a young daughter.

Both are BLs in which one of the leads is a teacher/tutor and the other his "delinquent with a heart of gold" student.

Both are slice of life, slower paced dramas with a FL who feels stuck in a rut in her life when she takes a trip and meets the ML who is deaf.

Both are wuxia dramas with a strong-willed and determined FL who starts weak and gradually grows stronger and a playful ML who has a long, life-threatening illness and some sort of secret about his identity. At one point in both dramas, the ML attempts to leave the FL so she won't know about his health, but is stopped. Both dramas end happily.

Both have the concept of "shadows", a historical setting, and a unique, striking color palette and style.

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Both have an historical palace setting with a slight twist of the real world (secondary transmigrated character vs. set in a novel) and a complicated anti-hero ML and FL with excellent chemistry in a slow burn romance. Both FLs have a very close relationship with the SFL who is part of the love triangle/reverse harem of the FL's love interest.

Both have time travel to the past and the FL trying to change events that happened in the future. Both have an antihero ML with a revenge plan who begins as the FL's enemy and ultimately becomes her love interest.

Both are a love story between the alien ML who has powers relating to time (erasing memory vs. stopping time) and the human FL. Both are mini dramas.

Both are mini dramas about a romance between the alien ML who comes to earth but can't stay long and a human FL who he stays with.

Both are a love story between the alien ML whose life on earth is threatened if he remains and the human FL.

Both are cute and quirky romances between an alien who comes to earth and has magical powers and a human.