Recommendations

Both are about the ML have a supernatural ability and his attempts to stop a murderer.
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Both are short length dramas in which the ML has the ability to see someone's death due to a special power. The plot revolves around him trying to stop what he sees.

Both are mystery-ish dramas about the lead(s) having the ability to foresee someone's death and their attempts to prevent it.

This is a drama version of the same webtoon where they based this reality and dating show come from.

It has a similar premise except that the female lead is fighting against the one who killed her parents.

- both involve the mystery of a dead classmate
- both are set in high school
- everybody is sus vibes
- both are psychological
- full of plot twists

If you enjoy family business drama and family tearing each other apart over company assets and inheritance.

Both have their father as a serial killer and alternate personality. Same murders take place.

Both are stories surrounding rich families who tries to expand their business empire especially around automobile.

-Both has Conglomerate families that contribute to the rising industries in South Korea before the 21st century.
-Main leads goal is revenge
-Both story spans over 2-3 generations

They are similar in terms of three women who have tight friendship, though Sweet Teeth is a pure Romantic Comedy drama and Thirty-Nine is a tearjerker drama. However, despite the two totally different storyline, if you're interested in seeing jealous worthy sismance between three women, then the two dramas are totally worth watching.

Furthermore, I think Sweet Teeth is focused more on the relationship between the three women and their partners and Thirty-Nine is more focused on a beautiful and touching story about the friendship of the three women.

Both are mini dramas with one of the leads trapped in a day long time loop.
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Both have the lead(s) trapped in a time loop to save a life/lives.
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Two very warm dramas that focus on food and cooking for each other and how food can be a wonderful love language between a couple. Both dramas bring comfort and joy between two people who share a love for food as well as a love for each other. These dramas feel like home.

Similarities:

Older female lead, and younger male lead

Teacher (piano professor?), and student/pupil

Differences:

Korean drama
Piano theme