Seo Ji Hye has been unlucky in her last 2 KDramas :
CLOY - Not satisfactory ending for her and second ML
Dinner Mate - A show with good start went downhill completely in last quarter
This one looks to be good show so far. The character played by her matches her inherent quirkiness. I sincerely wish this drama to succeed.

Kiss Sixth Sense is an aggregation of various genres - comedy, romance, supernatural, corporate life. So far they have meshed them together well. Hong Ye Sul is a successful office worker. She has been working with her mentor Cha Min Hoo for 5 years. HYS has ability to see future events of the person she kisses. This fact has prevented her from being a long term relationship with anyone. All is going well, when she accidentally kisses CMH and sees them together intimately in bed. This will on which story progresses.

As I said before they are trying to mix multiple genres together. Let's hope they do it well. OST is good, though I feel some sort of receptiveness and primitive quality in it.

Coming to some people's complaints regarding ML is falling short in looks department. I would argue with point. ML is 43+ actor. He is playing this 30+ role pretty well. One more problem I see in comment is related to cinematography. I've seen 200+ KDramas. If I've to rank its cinematography, it will definitely be in top 20 with respect to first 2 episodes.

Till episode 6 story was going in predictable direction, a bit monotonous too. Episode 7, 8 abruptly (in a good way), escalated the tension. To people who criticised FL on her seemingly impulsive behaviour: she suddenly comes to know that though her memories represent future, the underlying canvas on those memories is a figment of her own feelings and insecurities. Hence, she is troubled, hence, indecisive.

Please watch this you are interested in rom-com with a bit of supernatural element.