I didn't get what I started this drama for

If you're gonna sell it as a drama where a loner makes friends, then why does this plot arc only get around 1 episode. A person who has been alone would not be this natural at social cues and friendships and really would not be so comfortable confessing so fast and knowing exactly how to go about them.
I'm not sure why exactly the main lead was cast as the main lead. I am not the kind of person who criticizes so much about anything, but watching this drama was a really frustrating and dissapointing experience.