Trope #1: The 30-year-old-never-been-kissed virgin.
I totally understand this trope (maybe not in the way dramas portray it). Because I have never kissed anyone and my life is dandy. Nope, I'm not curious. I tend to focus my attention on moving forward in my pursuits. So, no it is not weird. People are different.
Trope #2: Adults falling in love with teen-agers.
This troupe exists because it happens in real life. It happens all the time in my country and I'm sure yours. Teenagers are done becoming people, becoming adults... no. But in many countries around the world they are considered adults and take on adult responsibilities and live adult lives.
Trope #3: Meeting the murder on a rooftop.
Every country and genre has stupid troups like this one. For example, the whole police squad being stupid (happens a lot in American action movies ) . Another example is when a blackmailer blackmails a killer and ends up dead. These silly troups are there to push the story along and because the writers are lazy.
Troup# 4: Reluctance to kiss
IRL: Intimacy for me is about trust. So just because I like you and you like me doesn't mean we are going to kiss. In dramas, the reluctance to kiss is meant to show pureness and unworldliness and sometimes it works well and sometimes it does not.