The Day of Becoming You (2021)

Both are about a relationship between a celebrity and a non-celebrity who end up involved.
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totally different but they both have the same vibe
you'll get what I mean after watching till the end

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- Body swap
- Romance comedy

Similar:
- ML had trouble with his family which he half resolves and lets go of
- FL is cheerful but not an airhead
- ML is considered expressionless
- Funny elements mixed in with more dramatic plot
- Relationship evolution and chemistry between couples

Difference:
- BTMFL is more slice of life, while DOBY has supernatural elements
- BTMFL shows life youth as office workers, while DOBY shows celeb life
- BTMFL focuses on meaning of love and marriage for a multi-cast while DOBY focuses on main couple's love story

- Body swap
- Romcom
- The ML experiencing 'women period' LOL

exchanging bodies

Both the dramas storyline revolve around either swiping body soul or swiping body's biological clock. Leads are connected to each other through this mysterious connection and become close to each other and fall in love.

Both dramas involve characters who get in an accident and wake up to find they've body-swapped with someone else. Both MLs are celebrities.

Both the plots revolve around the fact that the main leads switch bodies.
Both the MLs are arrogant.

The writer is the same in both dramas, giving off the same vibes. You can see so many similarities between the two.
The day of becoming you has a different story with fantasy elements( bodyswap), yet Hi venus is set in a medical setting.
The FL is the same in both dramas.
Both dramas are romantic and warm

Apart from the body swap, both dramas are too familiar. FL is sweet in both the dramas. Comedy and Romance are good in both of the dramas.

Both dramas feature a body swap between the male and female leads.
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Both had main leads that didn't get along at first. Both had misunderstood male leads. Both show a non-famous person dating a celebrity.

typical body swap dramas
the leads are in a relationship and have to live with bodies switched
TDOBY the swap returns to its original body but in Kojinsa Arimasu the story is a bit different

Both dramas have the main characters swapping bodies and experiencing a new perspective on life as a result.