Anyway, I liked a lot the ending. I didn't think it would have such an heart-warming ending. It also leaves the viewer to imagine what will happen next on his own. About the actors, I liked how Park Ye Jin played her role. She was cold but not enough to create a wall and make the character awkward, she was very classy and she expressed well the situations Lee Tae Ri got into. About Kim Kibum, this was the first drama I've seen him in and he didn't disappoint at all. He actually improved his character by a lot and made me cry at some parts. Well...not really cry but I did shed a tear. Anyway, the point is that the actors have been well chosen and there's no comment to that.
I can't say I admired the OST because I listened to it and it wasn't something extraordinary. Indeed, they had good music but it didn't affect me while watching the drama.
So...you go and watch I Love Lee Tae Ri :p