Kake kara Hajimaru Sayonara no Koi

- both working in the same company
- Fl is the ace in the office
- light hearted and fluffy romance

These share similar vibes. Both feature women known for their cold personalities at work, but are secretly in love with the golden retriever-esque ML. Both FLs have exaggerated acting and crazy inner monologues that add to the comedy and increase the sweetness factor.
I can't watch one of these without thinking of the other.

- relationship start with pretending as couple
-when you thought the lead didn’t like their ‘partner’, the truth is they are the mastermind behind their relationship
- lead seem cold, but actually really in love

Both leads got together due to an interesting circumstance (a bet vs a contract). The leads are in love with each other, but thinking the other party doesn't feel the same way. Does he/she love guess game! Both have Japanese humor but not too over-the-top. Also both have a business/office romance setting.