I am going to be sad if/when he leaves. 
First minute : "Yes  ! Please don't ever leave !"

Check the title of the drama : "This is going to break my heart right ?"
I'm in love wıth him :))
First thought: too hot to exist.
The second thought: I'm going to name my next pet after him.
At first i was like OMG! As he was telling her that he fell for her, I fell for him :D Badly!
He has a sweet and sensitive side to him.
Right now I am still super smitten and I am glad that he is finally being helpful towards Do Hyeon instead of ruining his life.
His scene with JI is soooo damn cute! I absolutely adore the skinship between them.
He actually listens to RiJin and finds better ways to handle the conflict.
His hair is also much sexier than DoHyeon's. His fashion sense is out of this world.
He is the one and only Shin Se Gi, don't forget and look deep into his eyes and be mesmerized!