Here's a test for your skills. I saw a short scene while flitting through youtube a number of months ago, but I can't remember the title or anything much so I'm hoping someone will be able to identify the drama from my description. I do know that it's Korean. Hopefully my memory serves me correctly...

There are two men and one woman in their mid 20's probably, I think two of them were on one couch and the other on another couch/bench/chair, with a large window background during the daytime. It keeps reminding me of a coffee shop for some reason, maybe because of the window. I believe they are trying to solve a murder case. The woman says that you can tell if a person is good or bad through a kiss, I think, or it might have been that you can recognize a person by their kiss. One of the guys gets up and kisses her to prove her wrong, but she has a reply to prove her theory right.

If you know what this drama is, thank you so much for relieving my mental agony! This snippet of a memory has left me so curious.

Maybe Gap Dong (lee joon)?

Love Me If You Dare 

The place is the living room of male lead's apartment. The victim of the case get kissed from the killer while wearing mask I think, and the victim said it is similar to her fiance's kiss style.

Here the scene

https://www.youtube.com/watch?v=gTXApRQuRQY



I think it's Love Me If You Dare

The link - Kissing Theory 

Wow, you guys are good. I was way off, definitely not Korean and definitely not a large window background or a cafe. Thanks so much!