Kana, who is stressed because of clueless Masa, is my favorite.
Stories like this may not be anything new, but I feel like I could enjoy this drama just fine. The comedic acting from some of the characters also makes the drama entertaining.
I personally like Sawa's character, not because she's tsundere, but because sometimes I struggle to express myself too.

I was slightly bothered when Kana said she wanted to marry Masa. However, I understand that a daughter's first love is her father (as long as the father isn't trash). Masa is a likable character.

In other words, watch this drama only if you're looking for something light and entertaining. Don't overthink it, just enjoy it.