I liked the premise of this drama.

A man who never lies...is that a good thing?

What is a lie?

Most people agree that saying something that isn't true is a lie. But...

...is not answering a question at all a lie?
...is not correct a faulty understanding a lie?
...is letting someone believe a lie when you know the truth but don't correct them out of compassion a lie?
...are all lies equal?
...are lies said to protect someone else okay?
...or is a lie a lie and you just should always answer every question with the truth?

Anyway, this drama poses those kinds of questions. The plot itself is quite cliché, but the philosophical probing was refreshing.

Also, the best thing about this drama is the ML's kid sister. SHE MAKES THIS DRAMA. WITHOUT HER, I PROBABLY WOULDN'T HAVE BOTHERED FINISHING IT.